Use base::MessageLoop in more files.

content/browser/renderer_host/render_widget_host_view_browsertest.cc

 // Copyright (c) 2013 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 "base/command_line.h"
 #include "base/message_loop_proxy.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
@@ skipping 152 matching lines @@
   // Waits until the source is available for copying.
   void WaitForCopySourceReady() {
     while (!GetRenderWidgetHostViewPort()->IsSurfaceAvailableForCopy())
       GiveItSomeTime();
   }
 
   // Run the current message loop for a short time without unwinding the current
   // call stack.
   static void GiveItSomeTime() {
     base::RunLoop run_loop;
-    MessageLoop::current()->PostDelayedTask(
+    base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE,
         run_loop.QuitClosure(),
         base::TimeDelta::FromMilliseconds(10));
     run_loop.Run();
   }
 
  private:
   const gfx::Size frame_size_;
   base::FilePath test_dir_;
   int callback_invoke_count_;
@@ skipping 229 matching lines @@
   run_loop.Run();
 
   EXPECT_EQ(2, callback_invoke_count());
   EXPECT_EQ(2, frames_captured());
 }
 
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
 }  // namespace
 }  // namespace content