Update the include paths of message_loop_proxy.h

cc/trees/proxy.cc

 // Copyright 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 "cc/trees/proxy.h"
 
-#include "base/message_loop_proxy.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
 
 namespace cc {
 
 base::SingleThreadTaskRunner* Proxy::MainThreadTaskRunner() const {
   return main_task_runner_.get();
 }
 
 bool Proxy::HasImplThread() const { return !!impl_task_runner_.get(); }
 
@@ skipping 57 matching lines @@
 
 Proxy::~Proxy() {
   DCHECK(IsMainThread());
 }
 
 std::string Proxy::SchedulerStateAsStringForTesting() {
   return "";
 }
 
 }  // namespace cc