Revert of Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_web_scheduler_impl.h

 // Copyright 2015 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_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_WEB_SCHEDULER_IMPL_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_WEB_SCHEDULER_IMPL_H_
 
 #include "platform/scheduler/child/web_scheduler_impl.h"
 
 namespace blink {
 namespace scheduler {
 
 class RendererSchedulerImpl;
 
 class PLATFORM_EXPORT RendererWebSchedulerImpl : public WebSchedulerImpl {
  public:
   explicit RendererWebSchedulerImpl(RendererSchedulerImpl* renderer_scheduler);
 
   ~RendererWebSchedulerImpl() override;
 
   // WebScheduler implementation:
-  WebTaskRunner* CompositorTaskRunner() override;
   void SuspendTimerQueue() override;
   void ResumeTimerQueue() override;
   std::unique_ptr<WebViewScheduler> CreateWebViewScheduler(
       InterventionReporter* intervention_reporter,
       WebViewScheduler::WebViewSchedulerSettings* settings) override;
 
  private:
   RendererSchedulerImpl* renderer_scheduler_;  // NOT OWNED
-  RefPtr<WebTaskRunnerImpl> compositor_task_runner_;
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_WEB_SCHEDULER_IMPL_H_