[Sync] Fix namespaces for the browser_sync component.

components/browser_sync/test_profile_sync_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 COMPONENTS_BROWSER_SYNC_TEST_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_TEST_PROFILE_SYNC_SERVICE_H_
 
 #include "base/macros.h"
 #include "components/browser_sync/profile_sync_service.h"
 #include "components/sync/base/weak_handle.h"
 #include "components/sync/driver/data_type_manager.h"
 #include "components/sync/js/js_event_handler.h"
 #include "components/sync/test/engine/test_id_factory.h"
 
 namespace sync_driver {
 class SyncPrefs;
 }  // namespace sync_driver
 
+namespace browser_sync {
+
 class TestProfileSyncService : public ProfileSyncService {
  public:
   explicit TestProfileSyncService(InitParams init_params);
 
   ~TestProfileSyncService() override;
 
   void OnConfigureDone(
       const sync_driver::DataTypeManager::ConfigureResult& result) override;
 
   // We implement our own version to avoid some DCHECKs.
@@ skipping 11 matching lines @@
   // js messages on UI loop when it's being destroyed, which are not deleted
   // and cause memory leak in test.
   syncer::WeakHandle<syncer::JsEventHandler> GetJsEventHandler() override;
 
  private:
   syncer::TestIdFactory id_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TestProfileSyncService);
 };
 
+}  // namespace browser_sync
+
 #endif  // COMPONENTS_BROWSER_SYNC_TEST_PROFILE_SYNC_SERVICE_H_