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diff --git a/upb/google/bridge.h b/upb/google/bridge.h
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-//
-// upb - a minimalist implementation of protocol buffers.
-//
-// Copyright (c) 2011-2012 Google Inc.  See LICENSE for details.
-// Author: Josh Haberman <jhaberman@gmail.com>
-//
-// This file contains functionality for constructing upb Defs and Handlers
-// corresponding to proto2 messages.  Using this functionality, you can use upb
-// to dynamically generate parsing code that can behave exactly like proto2's
-// generated parsing code.  Alternatively, you can configure things to
-// read/write only a subset of the fields for higher performance when only some
-// fields are needed.
-//
-// Example usage:
-//
-//   // JIT the parser; should only be done once ahead-of-time.
-//   upb::reffed_ptr<const upb::Handlers> write_myproto(
-//       upb::google::NewWriteHandlers(MyProto()));
-//   upb::reffed_ptr<const upb::Handlers> parse_myproto(
-//       upb::Decoder::NewDecoderHandlers(write_myproto.get(), true));
-//
-//   // The actual parsing.
-//   MyProto proto;
-//   upb::SeededPipeline<8192> pipeline(upb_realloc, NULL);
-//   upb::Sink* write_sink = pipeline.NewSink(write_myproto.get());
-//   upb::Sink* parse_sink = pipeline.NewSink(parse_myproto.get());
-//   upb::pb::Decoder* decoder = decoder_sink->GetObject<upb::pb::Decoder>();
-//   upb::pb::ResetDecoderSink(decoder, write_sink);
-//   write_sink->Reset(&proto);
-//
-// Note that there is currently no support for
-// CodedInputStream::SetExtensionRegistry(), which allows specifying a separate
-// DescriptorPool and MessageFactory for extensions.  Since this is a property
-// of the input in proto2, it's difficult to build a plan ahead-of-time that
-// can properly support this.  If it's an important use case, the caller should
-// probably build a upb plan explicitly.
-
-#ifndef UPB_GOOGLE_BRIDGE_H_
-#define UPB_GOOGLE_BRIDGE_H_
-
-#include <map>
-#include <vector>
-#include "upb/upb.h"
-
-namespace google {
-namespace protobuf {
-class FieldDescriptor;
-class Descriptor;
-class EnumDescriptor;
-class Message;
-}  // namespace protobuf
-}  // namespace google
-
-namespace proto2 {
-class FieldDescriptor;
-class Descriptor;
-class EnumDescriptor;
-class Message;
-}
-
-namespace upb {
-
-class Def;
-class EnumDef;
-class FieldDef;
-class MessageDef;
-class Handlers;
-
-namespace google {
-
-// Returns a upb::Handlers object that can be used to populate a proto2::Message
-// object of the same type as "m."  For more control over handler caching and
-// reuse, instantiate a CodeCache object below.
-upb::reffed_ptr<const upb::Handlers> NewWriteHandlers(const proto2::Message& m);
-upb::reffed_ptr<const upb::Handlers> NewWriteHandlers(
-    const ::google::protobuf::Message& m);
-
-// Builds upb::Defs from proto2::Descriptors, and caches all built Defs for
-// reuse.  CodeCache (below) uses this internally; there is no need to use this
-// class directly unless you only want Defs without corresponding Handlers.
-//
-// This class is NOT thread-safe.
-class DefBuilder {
- public:
-  // Functions to get or create a Def from a corresponding proto2 Descriptor.
-  // The returned def will be frozen.
-  //
-  // The caller must take a ref on the returned value if it needs it long-term.
-  // The DefBuilder will retain a ref so it can keep the Def cached, but
-  // garbage-collection functionality may be added to DefBuilder later that
-  // could unref the returned pointer.
-  const EnumDef* GetOrCreateEnumDef(const proto2::EnumDescriptor* d);
-  const EnumDef* GetOrCreateEnumDef(
-      const ::google::protobuf::EnumDescriptor* d);
-  const MessageDef* GetOrCreateMessageDef(const proto2::Descriptor* d);
-  const MessageDef* GetOrCreateMessageDef(
-      const ::google::protobuf::Descriptor* d);
-
-  // Gets or creates a frozen MessageDef, properly expanding weak fields.
-  //
-  // Weak fields are only represented as BYTES fields in the Descriptor (unless
-  // you construct your descriptors in a somewhat complicated way; see
-  // https://goto.google.com/weak-field-descriptor), but we can get their true
-  // definitions relatively easily from the proto Message class.
-  const MessageDef* GetOrCreateMessageDefExpandWeak(const proto2::Message& m);
-  const MessageDef* GetOrCreateMessageDefExpandWeak(
-      const ::google::protobuf::Message& m);
-
- private:
-  // Like GetOrCreateMessageDef*(), except the returned def might not be frozen.
-  // We need this function because circular graphs of MessageDefs need to all
-  // be frozen together, to we have to create the graphs of defs in an unfrozen
-  // state first.
-  //
-  // If m is non-NULL, expands weak message fields.
-  const MessageDef* GetOrCreateMaybeUnfrozenMessageDef(
-      const proto2::Descriptor* d, const proto2::Message* m);
-  const MessageDef* GetOrCreateMaybeUnfrozenMessageDef(
-      const ::google::protobuf::Descriptor* d,
-      const ::google::protobuf::Message* m);
-
-  // Returns a new-unfrozen FieldDef corresponding to this FieldDescriptor.
-  // The return value is always newly created (never cached) and the returned
-  // pointer is the only owner of it.
-  //
-  // If "m" is non-NULL, expands the weak field if it is one, and populates
-  // *subm_prototype with a prototype of the submessage if this is a weak or
-  // non-weak MESSAGE or GROUP field.
-  reffed_ptr<FieldDef> NewFieldDef(const proto2::FieldDescriptor* f,
-                                   const proto2::Message* m);
-  reffed_ptr<FieldDef> NewFieldDef(const ::google::protobuf::FieldDescriptor* f,
-                                   const ::google::protobuf::Message* m);
-
-  // Freeze all defs that haven't been frozen yet.
-  void Freeze();
-
-  template <class T>
-  T* AddToCache(const void *proto2_descriptor, reffed_ptr<T> def) {
-    assert(def_cache_.find(proto2_descriptor) == def_cache_.end());
-    def_cache_[proto2_descriptor] = def;
-    return def.get();  // Continued lifetime is guaranteed by cache.
-  }
-
-  template <class T>
-  const T* FindInCache(const void *proto2_descriptor) {
-    DefCache::iterator iter = def_cache_.find(proto2_descriptor);
-    return iter == def_cache_.end() ? NULL :
-        upb::down_cast<const T*>(iter->second.get());
-  }
-
- private:
-  // Maps a proto2 descriptor to the corresponding upb Def we have constructed.
-  // The proto2 descriptor is void* because the proto2 descriptor types do not
-  // share a common base.
-  typedef std::map<const void*, reffed_ptr<upb::Def> > DefCache;
-  DefCache def_cache_;
-
-  // Defs that have not been frozen yet.
-  vector<Def*> to_freeze_;
-};
-
-// Builds and caches upb::Handlers for populating proto2 generated classes.
-//
-// This class is NOT thread-safe.
-class CodeCache {
- public:
-  // Gets or creates handlers for populating messages of the given message type.
-  //
-  // The caller must take a ref on the returned value if it needs it long-term.
-  // The CodeCache will retain a ref so it can keep the Def cached, but
-  // garbage-collection functionality may be added to CodeCache later that could
-  // unref the returned pointer.
-  const Handlers* GetOrCreateWriteHandlers(const proto2::Message& m);
-  const Handlers* GetOrCreateWriteHandlers(
-      const ::google::protobuf::Message& m);
-
- private:
-  const Handlers* GetOrCreateMaybeUnfrozenWriteHandlers(
-      const MessageDef* md, const proto2::Message& m);
-  const Handlers* GetOrCreateMaybeUnfrozenWriteHandlers(
-      const MessageDef* md, const ::google::protobuf::Message& m);
-
-  Handlers* AddToCache(const MessageDef* md, reffed_ptr<Handlers> handlers) {
-    assert(handlers_cache_.find(md) == handlers_cache_.end());
-    handlers_cache_[md] = handlers;
-    return handlers.get();  // Continue lifetime is guaranteed by the cache.
-  }
-
-  const Handlers* FindInCache(const MessageDef* md) {
-    HandlersCache::iterator iter = handlers_cache_.find(md);
-    return iter == handlers_cache_.end() ? NULL : iter->second.get();
-  }
-
-  DefBuilder def_builder_;
-
-  typedef std::map<const MessageDef*, upb::reffed_ptr<const Handlers> >
-      HandlersCache;
-  HandlersCache handlers_cache_;
-
-  vector<Handlers*> to_freeze_;
-};
-
-}  // namespace google
-}  // namespace upb
-
-#endif  // UPB_GOOGLE_BRIDGE_H_