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

third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.h

 // Copyright 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.
 
 #ifndef THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_CHILD_COMPOSITOR_WORKER_SCHEDULER_H_
 #define THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_CHILD_COMPOSITOR_WORKER_SCHEDULER_H_
 
 #include "base/macros.h"
 #include "platform/scheduler/child/worker_scheduler.h"
 #include "public/platform/WebCommon.h"
 #include "public/platform/scheduler/child/single_thread_idle_task_runner.h"
 
 namespace base {
 class Thread;
 }
 
 namespace blink {
 namespace scheduler {
 
-class SchedulerTqmDelegate;
-
 class BLINK_PLATFORM_EXPORT CompositorWorkerScheduler
     : public WorkerScheduler,
       public SingleThreadIdleTaskRunner::Delegate {
  public:
-  CompositorWorkerScheduler(
-      base::Thread* thread,
-      scoped_refptr<SchedulerTqmDelegate> main_task_runner);
+  explicit CompositorWorkerScheduler(base::Thread* thread);
   ~CompositorWorkerScheduler() override;
 
   // WorkerScheduler:
   void Init() override;
 
   // ChildScheduler:
   scoped_refptr<TaskQueue> DefaultTaskRunner() override;
   scoped_refptr<scheduler::SingleThreadIdleTaskRunner> IdleTaskRunner()
       override;
   bool ShouldYieldForHighPriorityWork() override;
@@ skipping 12 matching lines @@
  private:
   base::Thread* thread_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorWorkerScheduler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_CHILD_COMPOSITOR_WORKER_SCHEDULER_H_