Fix include path for moved thread_task_runner_handle.h header in ppapi/

ppapi/proxy/ppapi_proxy_test.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 "ppapi/proxy/ppapi_proxy_test.h"
 
 #include <sstream>
 #include <tuple>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/observer_list.h"
 #include "base/process/process_handle.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "ipc/ipc_sync_channel.h"
 #include "ipc/message_filter.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_proxy_private.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/ppb_message_loop_proxy.h"
 
 namespace ppapi {
 namespace proxy {
 
@@ skipping 551 matching lines @@
 void TwoWayTest::PostTaskOnRemoteHarness(const base::Closure& task) {
   base::WaitableEvent task_complete(true, false);
   plugin_thread_.task_runner()->PostTask(
       FROM_HERE, base::Bind(&RunTaskOnRemoteHarness, task, &task_complete));
   task_complete.Wait();
 }
 
 
 }  // namespace proxy
 }  // namespace ppapi