Move MessageLoop to base namespace.

ui/views/test/webview_test_helper.cc

 // 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.
 
 #include "ui/views/test/webview_test_helper.h"
 
 #include "base/message_loop.h"
 #include "content/public/test/test_browser_thread.h"
 #include "content/public/test/test_content_client_initializer.h"
 #include "ui/views/controls/webview/webview.h"
 
 namespace views {
 
-WebViewTestHelper::WebViewTestHelper(MessageLoopForUI* ui_loop) {
+WebViewTestHelper::WebViewTestHelper(base::MessageLoopForUI* ui_loop) {
   test_content_client_initializer_.reset(
       new content::TestContentClientInitializer);
 
   // Setup to register a new RenderViewHost factory which manufactures
   // mock render process hosts. This ensures that we never create a 'real'
   // render view host since support for it doesn't exist in unit tests.
   test_content_client_initializer_->CreateTestRenderViewHosts();
 
   ui_thread_.reset(
       new content::TestBrowserThread(content::BrowserThread::UI, ui_loop));
 }
 
 WebViewTestHelper::~WebViewTestHelper() {
 }
 
 }  // namespace views