Use a direct include of the message_loop header in base/.

base/cancelable_callback_unittest.cc

 // Copyright (c) 2011 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 "base/cancelable_callback.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ref_counted.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace {
 
 class TestRefCounted : public RefCountedThreadSafe<TestRefCounted> {
  private:
   friend class RefCountedThreadSafe<TestRefCounted>;
   ~TestRefCounted() {};
@@ skipping 154 matching lines @@
   // Cancel before running the message loop.
   cancelable.Cancel();
   RunLoop().RunUntilIdle();
 
   // Callback never ran due to cancellation; count is the same.
   EXPECT_EQ(1, count);
 }
 
 }  // namespace
 }  // namespace base