Massively simplify the NetworkChangeNotifier infrastructure:...

chrome/common/net/thread_blocker.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.
-
-#ifndef CHROME_COMMON_NET_THREAD_BLOCKER_H_
-#define CHROME_COMMON_NET_THREAD_BLOCKER_H_
-
-// This class (mainly used for testing) lets you block and unblock a
-// thread at will.
-//
-// TODO(akalin): Consider moving this to base/ as this class is not
-// sync-specific (ask darin about it).
-
-#include "base/basictypes.h"
-#include "base/waitable_event.h"
-
-class MessageLoop;
-
-namespace base {
-class Thread;
-}  // namespace base
-
-namespace chrome_common_net {
-
-class ThreadBlocker {
- public:
-  // The given thread must already be started and it must outlive this
-  // instance.
-  explicit ThreadBlocker(base::Thread* target_thread);
-
-  // When this function returns, the target thread will be blocked
-  // until Unblock() is called.  Each call to Block() must be matched
-  // by a call to Unblock().
-  void Block();
-
-  // When this function returns, the target thread is unblocked.
-  void Unblock();
-
- private:
-  // On the target thread, blocks until Unblock() is called.
-  void BlockOnTargetThread();
-
-  MessageLoop* const target_message_loop_;
-  base::WaitableEvent is_blocked_, is_finished_blocking_, is_unblocked_;
-
-  DISALLOW_COPY_AND_ASSIGN(ThreadBlocker);
-};
-
-}  // namespace chrome_common_net
-
-#endif  // CHROME_COMMON_NET_THREAD_BLOCKER_H_