Revert of Worker: Introduce per-global-scope task scheduler

third_party/WebKit/Source/platform/scheduler/child/webthread_base.cc

 // Copyright 2014 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.
 
 // An implementation of WebThread in terms of base::MessageLoop and
 // base::Thread
 
 #include "public/platform/scheduler/child/webthread_base.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ptr_util.h"
 #include "base/pending_task.h"
 #include "base/threading/platform_thread.h"
 #include "platform/scheduler/child/compositor_worker_scheduler.h"
-#include "platform/scheduler/child/scheduler_tqm_delegate_impl.h"
 #include "platform/scheduler/child/webthread_impl_for_worker_scheduler.h"
 #include "platform/scheduler/utility/webthread_impl_for_utility_thread.h"
 #include "public/platform/WebTraceLocation.h"
 #include "public/platform/scheduler/child/single_thread_idle_task_runner.h"
 
 namespace blink {
 namespace scheduler {
 
 class WebThreadBase::TaskObserverAdapter
     : public base::MessageLoop::TaskObserver {
@@ skipping 84 matching lines @@
   explicit WebThreadForCompositor(base::Thread::Options options)
       : WebThreadImplForWorkerScheduler("Compositor", options) {
     Init();
   }
   ~WebThreadForCompositor() override {}
 
  private:
   // WebThreadImplForWorkerScheduler:
   std::unique_ptr<blink::scheduler::WorkerScheduler> CreateWorkerScheduler()
       override {
-    return base::MakeUnique<CompositorWorkerScheduler>(GetThread(),
-                                                       task_runner_delegate());
+    return base::MakeUnique<CompositorWorkerScheduler>(GetThread());
   }
 
   DISALLOW_COPY_AND_ASSIGN(WebThreadForCompositor);
 };
 
 }  // namespace
 
 std::unique_ptr<WebThreadBase> WebThreadBase::CreateWorkerThread(
     const char* name,
     base::Thread::Options options) {
   return base::MakeUnique<WebThreadImplForWorkerScheduler>(name, options);
 }
 
 std::unique_ptr<WebThreadBase> WebThreadBase::CreateCompositorThread(
     base::Thread::Options options) {
   return base::MakeUnique<WebThreadForCompositor>(options);
 }
 
 std::unique_ptr<WebThreadBase> WebThreadBase::InitializeUtilityThread() {
   return base::MakeUnique<WebThreadImplForUtilityThread>();
 }
 
 }  // namespace scheduler
 }  // namespace blink