Do not include task_queue.h in sequenced_task_checker_impl.h

webrtc/base/sequenced_task_checker_impl.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/base/sequenced_task_checker_impl.h"
 
 #include "webrtc/base/platform_thread.h"
 #include "webrtc/base/sequenced_task_checker.h"
+#include "webrtc/base/task_queue.h"
 
 namespace rtc {
 
 SequencedTaskCheckerImpl::SequencedTaskCheckerImpl()
     : attached_(true), valid_queue_(TaskQueue::Current()) {}
 
 SequencedTaskCheckerImpl::~SequencedTaskCheckerImpl() {}
 
 bool SequencedTaskCheckerImpl::CalledSequentially() const {
   TaskQueue* current_queue = TaskQueue::Current();
@@ skipping 18 matching lines @@
 
 SequencedTaskCheckerScope::SequencedTaskCheckerScope(
     const SequencedTaskChecker* checker) {
   RTC_DCHECK(checker->CalledSequentially());
 }
 
 SequencedTaskCheckerScope::~SequencedTaskCheckerScope() {}
 
 }  // namespace internal
 }  // namespace rtc