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

components/sync/driver/data_type_manager_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_DATA_TYPE_MANAGER_OBSERVER_H_
 #define COMPONENTS_SYNC_DRIVER_DATA_TYPE_MANAGER_OBSERVER_H_
 
 #include "components/sync/driver/data_type_manager.h"
 
-namespace sync_driver {
+namespace syncer {
 
 // Various data type configuration events can be consumed by observing the
 // DataTypeManager through this interface.
 class DataTypeManagerObserver {
  public:
   virtual void OnConfigureDone(
       const DataTypeManager::ConfigureResult& result) = 0;
   virtual void OnConfigureStart() = 0;
 
  protected:
   virtual ~DataTypeManagerObserver() {}
 };
 
-}  // namespace sync_driver
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_DATA_TYPE_MANAGER_OBSERVER_H_