[Sync] Refactor data type configuration/activation/deactivation

chrome/browser/sync/glue/sync_backend_host_mock.cc

 // Copyright (c) 2011 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/glue/sync_backend_host_mock.h"
 
 namespace browser_sync {
 
+using ::testing::_;
+
 ACTION(InvokeTask) {
   arg3.Run(true);
 }
 
 SyncBackendHostMock::SyncBackendHostMock() {
   // By default, invoke the ready callback.
-  ON_CALL(*this, ConfigureDataTypes(testing::_, testing::_, testing::_,
-    testing::_, testing::_)).
+  ON_CALL(*this, ConfigureDataTypes(_, _, _, _, _)).
       WillByDefault(InvokeTask());
 }
 
 SyncBackendHostMock::~SyncBackendHostMock() {}
 
 }  // namespace browser_sync