Use a direct include of the message_loop header in net/, part 2.

net/http/http_response_body_drainer_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 "net/http/http_response_body_drainer.h"
 
 #include <cstring>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_server_properties_impl.h"
 #include "net/http/http_stream.h"
 #include "net/proxy/proxy_service.h"
 #include "net/ssl/ssl_config_service_defaults.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 291 matching lines @@
 
 TEST_F(HttpResponseBodyDrainerTest, StartWithNothingToDo) {
   mock_stream_->set_num_chunks(0);
   drainer_->StartWithSize(session_.get(), 0);
   EXPECT_FALSE(result_waiter_.WaitForResult());
 }
 
 }  // namespace
 
 }  // namespace net