Remove unused shutdown() function from WebSchedulerImpl.

content/renderer/scheduler/web_scheduler_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_SCHEDULER_WEB_SCHEDULER_IMPL_H_
 #define CONTENT_RENDERER_SCHEDULER_WEB_SCHEDULER_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
@@ skipping 21 matching lines @@
                             blink::WebScheduler::IdleTask* task);
   virtual void postNonNestableIdleTask(const blink::WebTraceLocation& location,
                                        blink::WebScheduler::IdleTask* task);
   virtual void postIdleTaskAfterWakeup(const blink::WebTraceLocation& location,
                                        blink::WebScheduler::IdleTask* task);
   virtual void postLoadingTask(const blink::WebTraceLocation& location,
                                blink::WebThread::Task* task);
   virtual void postTimerTask(const blink::WebTraceLocation& location,
                              blink::WebThread::Task* task,
                              long long delayMs);
-  virtual void shutdown();
 
  private:
   static void runIdleTask(scoped_ptr<blink::WebScheduler::IdleTask> task,
                           base::TimeTicks deadline);
   static void runTask(scoped_ptr<blink::WebThread::Task> task);
 
   RendererScheduler* renderer_scheduler_;
   scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> loading_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> timer_task_runner_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SCHEDULER_WEB_SCHEDULER_IMPL_H_