cc: Remove safe_to_expect_begin_frame workaround

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 063872b0b39870c787181d05620d122c50e37235..9c3ad538730dea53db93774dbe6bef71ff9c61f8 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -119,9 +119,6 @@ class CC_EXPORT Scheduler {
   base::WeakPtrFactory<Scheduler> weak_factory_;
   bool last_set_needs_begin_frame_;
   bool has_pending_begin_frame_;
-  // TODO(brianderson): crbug.com/249806 : Remove safe_to_expect_begin_frame_
-  // workaround.
-  bool safe_to_expect_begin_frame_;
   BeginFrameArgs last_begin_frame_args_;
 
   SchedulerStateMachine state_machine_;