Remove unused include in sequenced_worker_pool.h

cc/output/context_cache_controller.cc

 // Copyright (c) 2016 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 "cc/output/context_cache_controller.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
-#include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "gpu/command_buffer/client/context_support.h"
 #include "third_party/skia/include/gpu/GrContext.h"
 
 namespace cc {
 namespace {
 static const int kIdleCleanupDelaySeconds = 1;
 }  // namespace
 
 ContextCacheController::ScopedToken::ScopedToken() = default;
@@ skipping 145 matching lines @@
   context_support_->SetAggressivelyFreeResources(true);
   context_support_->SetAggressivelyFreeResources(false);
 
   callback_pending_ = false;
 
   if (context_lock_)
     context_lock_->Release();
 }
 
 }  // namespace cc