Revert of Change VirtualTimePolicy::PAUSE_IF_NETWORK_FETCHES_PENDING

components/scheduler/renderer/throttling_helper.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 COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
 #define COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
 
 #include <set>
 
 #include "base/macros.h"
@@ skipping 32 matching lines @@
   void IncreaseThrottleRefCount(TaskQueue* task_queue);
 
   // If the refcouint is non-zero it's decremented.  If the throttled refcount
   // becomes zero then |task_queue| is unthrottled.  If the refcount was already
   // zero this function does nothing.
   void DecreaseThrottleRefCount(TaskQueue* task_queue);
 
   // Removes |task_queue| from |throttled_queues_|.
   void UnregisterTaskQueue(TaskQueue* task_queue);
 
-  // Tells the ThrottlingHelper we're using virtual time, which disables all
-  // throttling.
-  void EnableVirtualTime();
-
   const ThrottledTimeDomain* time_domain() const { return time_domain_.get(); }
 
   static base::TimeTicks ThrottledRunTime(base::TimeTicks unthrottled_runtime);
 
   const scoped_refptr<TaskQueue>& task_runner() const { return task_runner_; }
 
  private:
   struct Metadata {
     Metadata() : throttling_ref_count(0), enabled(false) {}
 
@@ skipping 16 matching lines @@
       base::TimeTicks unthrottled_runtime);
 
   TaskQueueMap throttled_queues_;
   base::Closure forward_immediate_work_closure_;
   scoped_refptr<TaskQueue> task_runner_;
   RendererSchedulerImpl* renderer_scheduler_;  // NOT OWNED
   base::TickClock* tick_clock_;                // NOT OWNED
   const char* tracing_category_;               // NOT OWNED
   std::unique_ptr<ThrottledTimeDomain> time_domain_;
 
-  CancelableClosureHolder pump_throttled_tasks_closure_;
+  CancelableClosureHolder suspend_timers_when_backgrounded_closure_;
   base::TimeTicks pending_pump_throttled_tasks_runtime_;
-  bool virtual_time_;
 
   base::WeakPtrFactory<ThrottlingHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThrottlingHelper);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_