Move CancellationFlag and WaitableEvent to the synchronization subdirectory....

chrome/test/signaling_task.h

 // Copyright (c) 2010 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.
 
 // A simple callback that you can use to wait for events on a thread.
 
 #ifndef CHROME_TEST_SIGNALING_TASK_H_
 #define CHROME_TEST_SIGNALING_TASK_H_
 #pragma once
 
-#include "base/waitable_event.h"
+#include "base/synchronization/waitable_event.h"
 
 using base::WaitableEvent;
 
 class SignalingTask : public Task {
  public:
   explicit SignalingTask(WaitableEvent* event) : event_(event) {
   }
 
   virtual void Run() {
     event_->Signal();
   }
 
  private:
   WaitableEvent* event_;
 };
 
 #endif  // CHROME_TEST_SIGNALING_TASK_H_