Move MessageLoop to base namespace.

ui/aura/test/aura_test_helper.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 UI_AURA_TEST_AURA_TEST_HELPER_H_
 #define UI_AURA_TEST_AURA_TEST_HELPER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
+namespace base {
 class MessageLoopForUI;
+}
 
 namespace ui {
 class InputMethod;
 class ScopedAnimationDurationScaleMode;
 }
 
 namespace aura {
 class RootWindow;
 class TestScreen;
 namespace client {
 class DefaultCaptureClient;
 class FocusClient;
 }
 namespace test {
 class TestActivationClient;
 class TestStackingClient;
 
 // A helper class owned by tests that does common initialization required for
 // Aura use. This class creates a root window with clients and other objects
 // that are necessary to run test on Aura.
 class AuraTestHelper {
  public:
-  explicit AuraTestHelper(MessageLoopForUI* message_loop);
+  explicit AuraTestHelper(base::MessageLoopForUI* message_loop);
   ~AuraTestHelper();
 
   // Creates and initializes (shows and sizes) the RootWindow for use in tests.
   void SetUp();
 
   // Clean up objects that are created for tests. This also deletes the Env
   // object.
   void TearDown();
 
   // Flushes message loop.
   void RunAllPendingInMessageLoop();
 
   RootWindow* root_window() { return root_window_.get(); }
 
   TestScreen* test_screen() { return test_screen_.get(); }
 
  private:
-  MessageLoopForUI* message_loop_;
+  base::MessageLoopForUI* message_loop_;
   bool setup_called_;
   bool teardown_called_;
   bool owns_root_window_;
   scoped_ptr<RootWindow> root_window_;
   scoped_ptr<TestStackingClient> stacking_client_;
   scoped_ptr<TestActivationClient> test_activation_client_;
   scoped_ptr<client::DefaultCaptureClient> capture_client_;
   scoped_ptr<ui::InputMethod> test_input_method_;
   scoped_ptr<client::FocusClient> focus_client_;
   scoped_ptr<TestScreen> test_screen_;
   scoped_ptr<ui::ScopedAnimationDurationScaleMode> zero_duration_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraTestHelper);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_AURA_TEST_HELPER_H_