cc:: Remove main_frame_before_draw_enabled from scheduler settings.

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index e98f96689e16f247bf23482997264bb49bb8db9c..8d34b6322e112a99e844c202c7ffb57e25a93e65 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -91,9 +91,6 @@ Scheduler::Scheduler(
                settings_.AsValue());
   DCHECK(client_);
   DCHECK(!state_machine_.BeginFrameNeeded());
-  if (settings_.main_frame_before_activation_enabled) {
-    DCHECK(settings_.main_frame_before_draw_enabled);
-  }
 
   begin_retro_frame_closure_ =
       base::Bind(&Scheduler::BeginRetroFrame, weak_factory_.GetWeakPtr());