Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/engine/syncer_proto_util.h

Index: chrome/browser/sync/engine/syncer_proto_util.h
diff --git a/chrome/browser/sync/engine/syncer_proto_util.h b/chrome/browser/sync/engine/syncer_proto_util.h
index 0b209a7d752ea73640acbc1701ba9dc07c933ee8..313a271b10f5fe51552055cc6db91d496ba1341e 100644
--- a/chrome/browser/sync/engine/syncer_proto_util.h
+++ b/chrome/browser/sync/engine/syncer_proto_util.h
@@ -11,6 +11,7 @@
 #include "base/gtest_prod_util.h"
 #include "base/time.h"
 #include "chrome/browser/sync/sessions/sync_session.h"
+#include "chrome/browser/sync/engine/syncer_error.h"
 #include "chrome/browser/sync/syncable/blob.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
@@ -42,7 +43,7 @@ class SyncerProtoUtil {
   // Returns true on success.  Also handles store birthday verification:
   // session->status()->syncer_stuck_ is set true if the birthday is
   // incorrect.  A false value will always be returned if birthday is bad.
-  static bool PostClientToServerMessage(
+  static SyncerError PostClientToServerMessage(
       const ClientToServerMessage& msg,
       sync_pb::ClientToServerResponse* response,
       sessions::SyncSession* session);