Use a direct include of the message_loop header in chrome/browser/, part 10.

chrome/browser/storage_monitor/image_capture_device_manager_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/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/mac/foundation_util.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "chrome/browser/storage_monitor/image_capture_device.h"
 #include "chrome/browser/storage_monitor/image_capture_device_manager.h"
 #include "chrome/browser/storage_monitor/test_storage_monitor.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
 
 @interface NSObject (ICCameraDeviceDelegateLionAPI)
@@ skipping 409 matching lines @@
   message_loop_.RunUntilIdle();
 
   char file_contents[5];
   ASSERT_EQ(4, file_util::ReadFile(temp_file, file_contents,
                                    strlen(kTestFileContents)));
   EXPECT_EQ(kTestFileContents,
             std::string(file_contents, strlen(kTestFileContents)));
 
   [camera didRemoveDevice:device];
 }