Replace changes_channel with an observer list.

chrome/browser/sync/engine/syncer_command.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/engine/syncer_command.h"
 
 #include "chrome/browser/sync/engine/net/server_connection_manager.h"
 #include "chrome/browser/sync/sessions/sync_session.h"
 #include "chrome/browser/sync/syncable/directory_manager.h"
 #include "chrome/browser/sync/util/sync_types.h"
@@ skipping 16 matching lines @@
   if (!dir.good()) {
     LOG(ERROR) << "Scoped dir lookup failed!";
     return;
   }
 
   if (session->status_controller()->TestAndClearIsDirty()) {
     SyncerEvent event(SyncerEvent::STATUS_CHANGED);
     const sessions::SyncSessionSnapshot& snapshot(session->TakeSnapshot());
     event.snapshot = &snapshot;
     DCHECK(session->context()->syncer_event_channel());
-    session->context()->syncer_event_channel()->NotifyListeners(event);
+    session->context()->syncer_event_channel()->Notify(event);
     if (session->status_controller()->syncer_status().over_quota) {
       SyncerEvent quota_event(SyncerEvent::OVER_QUOTA);
       quota_event.snapshot = &snapshot;
-      session->context()->syncer_event_channel()->NotifyListeners(quota_event);
+      session->context()->syncer_event_channel()->Notify(quota_event);
     }
   }
 }
 
 }  // namespace browser_sync