cc: Remove retro frame logic from scheduler.

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 09bac9a0883627c5e28006e34ca9a3b8a140407c..deefb48c4b6672a88eb057709979a3c7a1723e47 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -163,15 +163,14 @@ class CC_EXPORT Scheduler : public BeginFrameObserverBase {
   std::unique_ptr<CompositorTimingHistory> compositor_timing_history_;
   base::TimeDelta estimated_parent_draw_time_;
 
-  std::deque<BeginFrameArgs> begin_retro_frame_args_;
   SchedulerStateMachine::BeginImplFrameDeadlineMode
       begin_impl_frame_deadline_mode_;
   BeginFrameTracker begin_impl_frame_tracker_;
   BeginFrameArgs begin_main_frame_args_;
 
-  base::Closure begin_retro_frame_closure_;
+  base::CancelableClosure missed_begin_frame_task_;
+
   base::Closure begin_impl_frame_deadline_closure_;
-  base::CancelableClosure begin_retro_frame_task_;
   base::CancelableClosure begin_impl_frame_deadline_task_;
 
   SchedulerStateMachine state_machine_;
@@ -183,7 +182,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverBase {
   void ScheduleBeginImplFrameDeadlineIfNeeded();
   void BeginImplFrameNotExpectedSoon();
   void SetupNextBeginFrameIfNeeded();
-  void PostBeginRetroFrameIfNeeded();
   void DrawAndSwapIfPossible();
   void DrawAndSwapForced();
   void ProcessScheduledActions();
@@ -197,7 +195,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverBase {
       base::TimeDelta bmf_to_activate_estimate) const;
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;
-  void BeginRetroFrame();
   void BeginImplFrameWithDeadline(const BeginFrameArgs& args);
   void BeginImplFrameSynchronous(const BeginFrameArgs& args);
   void BeginImplFrame(const BeginFrameArgs& args);