content: Use base::MessageLoop.

content/browser/renderer_host/popup_menu_helper_mac.mm

 // 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.
 
 #import <Carbon/Carbon.h>
 
 #include "content/browser/renderer_host/popup_menu_helper_mac.h"
 
 #import "base/mac/scoped_sending_event.h"
 #include "base/memory/scoped_nsobject.h"
@@ skipping 35 matching lines @@
       ([rwhvm->cocoa_view() retain]);
 
   // Display the menu.
   scoped_nsobject<WebMenuRunner> menu_runner;
   menu_runner.reset([[WebMenuRunner alloc] initWithItems:items
                                                 fontSize:item_font_size
                                             rightAligned:right_aligned]);
 
   {
     // Make sure events can be pumped while the menu is up.
-    MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
+    base::MessageLoop::ScopedNestableTaskAllower allow(
+        base::MessageLoop::current());
 
     // One of the events that could be pumped is |window.close()|.
     // User-initiated event-tracking loops protect against this by
     // setting flags in -[CrApplication sendEvent:], but since
     // web-content menus are initiated by IPC message the setup has to
     // be done manually.
     base::mac::ScopedSendingEvent sending_event_scoper;
 
     // Now run a SYNCHRONOUS NESTED EVENT LOOP until the pop-up is finished.
     [menu_runner runMenuInView:cocoa_view
@@ skipping 21 matching lines @@
 
 void PopupMenuHelper::Observe(int type,
                               const NotificationSource& source,
                               const NotificationDetails& details) {
   DCHECK(type == NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED);
   DCHECK(Source<RenderWidgetHost>(source).ptr() == render_view_host_);
   render_view_host_ = NULL;
 }
 
 }  // namespace content