Revert of Run task queue manager work in batches

content/renderer/scheduler/renderer_scheduler_impl.h

Index: content/renderer/scheduler/renderer_scheduler_impl.h
diff --git a/content/renderer/scheduler/renderer_scheduler_impl.h b/content/renderer/scheduler/renderer_scheduler_impl.h
index 53dec79556495f8e5de122905b9714bdd18c527d..d4fe05413c51023dc637eaaa98b7d5d59437dcf3 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl.h
+++ b/content/renderer/scheduler/renderer_scheduler_impl.h
@@ -8,7 +8,6 @@
 #include "base/atomicops.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
-#include "cc/test/test_now_source.h"
 #include "content/renderer/scheduler/renderer_scheduler.h"
 #include "content/renderer/scheduler/single_thread_idle_task_runner.h"
 #include "content/renderer/scheduler/task_queue_manager.h"
@@ -42,7 +41,9 @@
   bool ShouldYieldForHighPriorityWork() override;
   void Shutdown() override;
 
-  void SetTimeSourceForTesting(scoped_refptr<cc::TestNowSource> time_source);
+ protected:
+  // Virtual for testing.
+  virtual base::TimeTicks Now() const;
 
  private:
   friend class RendererSchedulerImplTest;
@@ -114,8 +115,6 @@
   void StartIdlePeriod();
   void EndIdlePeriod();
 
-  base::TimeTicks Now() const;
-
   base::ThreadChecker main_thread_checker_;
   scoped_ptr<RendererTaskQueueSelector> renderer_task_queue_selector_;
   scoped_ptr<TaskQueueManager> task_queue_manager_;
@@ -139,8 +138,6 @@
   base::TimeTicks last_input_time_;
   PollableNeedsUpdateFlag policy_may_need_update_;
 
-  scoped_refptr<cc::TestNowSource> time_source_;
-
   base::WeakPtr<RendererSchedulerImpl> weak_renderer_scheduler_ptr_;
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;