[Sync] Move //components/sync to the syncer namespace.

components/sync/driver/protocol_event_observer.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_SYNC_DRIVER_PROTOCOL_EVENT_OBSERVER_H_
 #define COMPONENTS_SYNC_DRIVER_PROTOCOL_EVENT_OBSERVER_H_
 
 namespace syncer {
+
 class ProtocolEvent;
-}
-
-namespace browser_sync {
 
 class ProtocolEventObserver {
  public:
   ProtocolEventObserver();
   virtual ~ProtocolEventObserver();
 
-  virtual void OnProtocolEvent(const syncer::ProtocolEvent& event) = 0;
+  virtual void OnProtocolEvent(const ProtocolEvent& event) = 0;
 };
 
-}  // namespace browser_sync
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_PROTOCOL_EVENT_OBSERVER_H_