Allow cc::Scheduler begin frame source to be changed

cc/test/scheduler_test_common.h

Index: cc/test/scheduler_test_common.h
diff --git a/cc/test/scheduler_test_common.h b/cc/test/scheduler_test_common.h
index 259e991880d9e90baafb1bc2660fc7e1a2dff137..414f31f5d7d0161d64747bbac26eefbce826e75d 100644
--- a/cc/test/scheduler_test_common.h
+++ b/cc/test/scheduler_test_common.h
@@ -233,9 +233,6 @@ class TestScheduler : public Scheduler {
   }
 
   BeginFrameSource& frame_source() { return *begin_frame_source_; }
-  bool FrameProductionThrottled() {
-    return settings_.throttle_frame_production;
-  }
 
   bool MainThreadMissedLastDeadline() const {
     return state_machine_.main_thread_missed_last_deadline();