chrome: Use base::MessageLoop. (Part 3)

chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.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 <Foundation/Foundation.h>
 #import <ImageCaptureCore/ImageCaptureCore.h>
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/mac/cocoa_protocols.h"
@@ skipping 280 matching lines @@
   virtual void TearDown() OVERRIDE {
     id<ICDeviceBrowserDelegate> delegate = manager_.device_browser();
     [delegate deviceBrowser:nil didRemoveDevice:camera_ moreGoing:NO];
 
     delegate_->CancelPendingTasksAndDeleteDelegate();
 
     io_thread_->Stop();
   }
 
  protected:
-  MessageLoopForUI message_loop_;
+  base::MessageLoopForUI message_loop_;
   // Note: threads must be made in this order: UI > FILE > IO
   scoped_ptr<content::TestBrowserThread> ui_thread_;
   scoped_ptr<content::TestBrowserThread> file_thread_;
   scoped_ptr<content::TestBrowserThread> io_thread_;
   base::ScopedTempDir temp_dir_;
   chrome::test::TestStorageMonitor monitor_;
   chrome::ImageCaptureDeviceManager manager_;
   MockMTPICCameraDevice* camera_;
 
   // This object needs special deletion inside the above |task_runner_|.
@@ skipping 250 matching lines @@
                          temp_dir_.path().Append("target")));
 
   EXPECT_EQ(base::PLATFORM_FILE_OK,
              DownloadFile(base::FilePath("/ic:id/filename"),
                           temp_dir_.path().Append("target")));
   std::string contents;
   EXPECT_TRUE(file_util::ReadFileToString(temp_dir_.path().Append("target"),
                                           &contents));
   EXPECT_EQ(kTestFileContents, contents);
 }