Use a direct include of the message_loop header in content/, part 1.

content/browser/download/download_manager_impl_unittest.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 <set>
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/stl_util.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "content/browser/byte_stream.h"
 #include "content/browser/download/download_create_info.h"
 #include "content/browser/download/download_file_factory.h"
 #include "content/browser/download/download_item_factory.h"
 #include "content/browser/download/download_item_impl.h"
@@ skipping 639 matching lines @@
       .WillOnce(Return());
   EXPECT_CALL(GetMockDownloadItem(3), Remove())
       .Times(0);
 
   download_manager_->RemoveAllDownloads();
   // Because we're mocking the download item, the Remove call doesn't
   // result in them being removed from the DownloadManager list.
 }
 
 }  // namespace content