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

content/browser/byte_stream_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 "content/browser/byte_stream.h"
 
 #include <deque>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/test/test_simple_task_runner.h"
 #include "net/base/io_buffer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 namespace {
 
 void CountCallbacks(int* counter) {
   ++*counter;
 }
@@ skipping 475 matching lines @@
   byte_stream_output->RegisterCallback(
       base::Bind(CountCallbacks, &num_callbacks));
 
   // Immediately close the stream.
   byte_stream_input->Close(DOWNLOAD_INTERRUPT_REASON_NONE);
   task_runner->RunUntilIdle();
   EXPECT_EQ(1, num_callbacks);
 }
 
 }  // namespace content