Massively simplify the NetworkChangeNotifier infrastructure:...

chrome/common/net/thread_blocker.cc

-// 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.
-
-#include "chrome/common/net/thread_blocker.h"
-
-#include "base/logging.h"
-#include "base/message_loop.h"
-#include "base/task.h"
-#include "base/thread.h"
-#include "base/waitable_event.h"
-
-// Since a ThreadBlocker is outlived by its target thread, we don't
-// have to ref-count it.
-DISABLE_RUNNABLE_METHOD_REFCOUNT(chrome_common_net::ThreadBlocker);
-
-namespace chrome_common_net {
-
-ThreadBlocker::ThreadBlocker(base::Thread* target_thread)
-    : target_message_loop_(target_thread->message_loop()),
-      is_blocked_(false, false), is_finished_blocking_(false, false),
-      is_unblocked_(false, false) {
-  DCHECK(target_message_loop_);
-}
-
-void ThreadBlocker::Block() {
-  DCHECK_NE(MessageLoop::current(), target_message_loop_);
-  target_message_loop_->PostTask(
-      FROM_HERE,
-      NewRunnableMethod(this, &ThreadBlocker::BlockOnTargetThread));
-  while (!is_blocked_.Wait()) {}
-}
-
-void ThreadBlocker::Unblock() {
-  DCHECK_NE(MessageLoop::current(), target_message_loop_);
-  is_finished_blocking_.Signal();
-  while (!is_unblocked_.Wait()) {}
-}
-
-void ThreadBlocker::BlockOnTargetThread() {
-  DCHECK_EQ(MessageLoop::current(), target_message_loop_);
-  is_blocked_.Signal();
-  while (!is_finished_blocking_.Wait()) {}
-  is_unblocked_.Signal();
-}
-
-}  // namespace chrome_common_net