Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/engine/post_commit_message_command.cc

Index: chrome/browser/sync/engine/post_commit_message_command.cc
diff --git a/chrome/browser/sync/engine/post_commit_message_command.cc b/chrome/browser/sync/engine/post_commit_message_command.cc
index c70a1936d96d4b69165effccf1faf9e8bd105b76..5b75f761fe734f47e9b93037888a043718ec088c 100644
--- a/chrome/browser/sync/engine/post_commit_message_command.cc
+++ b/chrome/browser/sync/engine/post_commit_message_command.cc
@@ -19,17 +19,19 @@ namespace browser_sync {
 PostCommitMessageCommand::PostCommitMessageCommand() {}
 PostCommitMessageCommand::~PostCommitMessageCommand() {}
 
-void PostCommitMessageCommand::ExecuteImpl(sessions::SyncSession* session) {
+SyncerError PostCommitMessageCommand::ExecuteImpl(
+    sessions::SyncSession* session) {
   if (session->status_controller().commit_ids().empty())
-    return;  // Nothing to commit.
+    return NO_ERROR;  // Nothing to commit.
   ClientToServerResponse response;
   syncable::ScopedDirLookup dir(session->context()->directory_manager(),
                                 session->context()->account_name());
   if (!dir.good())
-    return;
+    return DIRECTORY_LOOKUP_FAILED;
   sessions::StatusController* status = session->mutable_status_controller();
-  if (!SyncerProtoUtil::PostClientToServerMessage(status->commit_message(),
-          &response, session)) {
+  SyncerError result = SyncerProtoUtil::PostClientToServerMessage(
+      status->commit_message(), &response, session);
+  if (result != NO_ERROR) {
     // None of our changes got through.  Clear the SYNCING bit which was
     // set to true during BuildCommitCommand, and which may still be true.
     // Not to be confused with IS_UNSYNCED, this bit is used to detect local
@@ -41,11 +43,12 @@ void PostCommitMessageCommand::ExecuteImpl(sessions::SyncSession* session) {
       syncable::MutableEntry entry(&trans, syncable::GET_BY_ID, commit_ids[i]);
       entry.Put(syncable::SYNCING, false);
     }
-    return;
-  } else {
-    status->set_items_committed();
+    return result;
   }
+
+  status->set_items_committed();
   status->mutable_commit_response()->CopyFrom(response);
+  return NO_ERROR;
 }
 
 }  // namespace browser_sync