[Sync] Put everything in sync/api into csync namespace

sync/api/fake_syncable_service.h

 // Copyright (c) 2012 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 SYNC_API_FAKE_SYNCABLE_SERVICE_H_
 #define SYNC_API_FAKE_SYNCABLE_SERVICE_H_
 #pragma once
 
 #include "sync/api/syncable_service.h"
 
+namespace csync {
+
 class SyncErrorFactory;
 
 // A fake SyncableService that can return arbitrary values and maintains the
 // syncing status.
 class FakeSyncableService : public SyncableService {
  public:
   FakeSyncableService();
   virtual ~FakeSyncableService();
 
   // Setters for SyncableService implementation results.
@@ skipping 17 matching lines @@
       const SyncChangeList& change_list) OVERRIDE;
 
  private:
   scoped_ptr<SyncChangeProcessor> sync_processor_;
   SyncError merge_data_and_start_syncing_error_;
   SyncError process_sync_changes_error_;
   bool syncing_;
   syncable::ModelType type_;
 };
 
+}  // namespace csync
+
 #endif  // SYNC_API_FAKE_SYNCABLE_SERVICE_H_