[Sync] Fix namespaces for the browser_sync component.

chrome/browser/ui/toolbar/recent_tabs_sub_menu_model_unittest.cc

 // Copyright 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.
 
 #include "chrome/browser/ui/toolbar/recent_tabs_sub_menu_model.h"
 
 #include <memory>
 #include <string>
 #include <vector>
 
@@ skipping 148 matching lines @@
   sync_sessions::OpenTabsUIDelegate* GetOpenTabsDelegate() {
     return manager_.get();
   }
 
   void RegisterRecentTabs(RecentTabsBuilderTestHelper* helper) {
     helper->ExportToSessionsSyncManager(manager_.get());
   }
 
  private:
   TestingProfile testing_profile_;
-  ProfileSyncServiceMock sync_service_;
+  browser_sync::ProfileSyncServiceMock sync_service_;
   std::unique_ptr<sync_driver::SyncPrefs> sync_prefs_;
   std::unique_ptr<sync_sessions::SessionsSyncManager> manager_;
   std::unique_ptr<sync_driver::LocalDeviceInfoProviderMock> local_device_;
 };
 
 // Test disabled "Recently closed" header with no foreign tabs.
 TEST_F(RecentTabsSubMenuModelTest, NoTabs) {
   TestRecentTabsSubMenuModel model(NULL, browser(), NULL);
 
   // Expected menu:
@@ skipping 427 matching lines @@
   // 2           Recently closed heaer (disabled)
   // 3           <separator>
   // 4           No tabs from other Devices
 
   TestRecentTabsSubMenuModel model(NULL, browser(), NULL);
   EXPECT_EQ(5, model.GetItemCount());
   EXPECT_EQ(-1, model.GetMaxWidthForItemAtIndex(2));
   EXPECT_NE(-1, model.GetMaxWidthForItemAtIndex(3));
   EXPECT_EQ(-1, model.GetMaxWidthForItemAtIndex(4));
 }