Make all handlers objects refcounted.

I'm realizing that basically all upb objects
will need to be refcounted to be sharable
across languages, but *not* messages which
are on their way out so we can get out of
the business of data representations.

Things which must be refcounted:
- encoders, decoders
- handlers objects
- defs

1 files changed, 1 insertions, 1 deletions

diff --git a/src/upb_string.h b/src/upb_string.h
index e017268..1463bbf 100644
--- a/src/upb_string.h
+++ b/src/upb_string.h
@@ -59,7 +59,7 @@ extern "C" {
 // the associated functions.
 struct _upb_string {
   // The string's refcount.
-  upb_atomic_refcount_t refcount;
+  upb_atomic_t refcount;
 
   // The pointer to our currently active data.  This may be memory we own
   // or a pointer into memory we don't own.