Move the thread test helper to base/test

chrome/test/thread_test_helper.h

-// 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.
-
-#ifndef CHROME_TEST_THREAD_TEST_HELPER_H_
-#define CHROME_TEST_THREAD_TEST_HELPER_H_
-#pragma once
-
-#include "base/compiler_specific.h"
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/waitable_event.h"
-#include "content/browser/browser_thread.h"
-
-// Helper class that executes code on a given thread while blocking on the
-// invoking thread (normally the UI thread). To use, derive from this class and
-// overwrite RunTest. An alternative use of this class is to use it directly.
-// It will then block until all pending tasks on a given thread have been
-// executed.
-class ThreadTestHelper : public base::RefCountedThreadSafe<ThreadTestHelper> {
- public:
-  explicit ThreadTestHelper(BrowserThread::ID thread_id);
-
-  // True if RunTest() was successfully executed on the target thread.
-  bool Run() WARN_UNUSED_RESULT;
-
-  virtual void RunTest();
-
- protected:
-  friend class base::RefCountedThreadSafe<ThreadTestHelper>;
-
-  virtual ~ThreadTestHelper();
-
-  // Use this method to store the result of RunTest().
-  void set_test_result(bool test_result) { test_result_ = test_result; }
-
- private:
-  void RunInThread();
-
-  bool test_result_;
-  BrowserThread::ID thread_id_;
-  base::WaitableEvent done_event_;
-
-  DISALLOW_COPY_AND_ASSIGN(ThreadTestHelper);
-};
-
-#endif  // CHROME_TEST_THREAD_TEST_HELPER_H_