cc: Do not use deadline state for scheduler unittests.

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 017307eb5f9f976edf5a37ce0e6f6b29756ee376..09bac9a0883627c5e28006e34ca9a3b8a140407c 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -117,9 +117,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverBase {
   bool PrepareTilesPending() const {
     return state_machine_.PrepareTilesPending();
   }
-  bool BeginImplFrameDeadlinePending() const {
-    return !begin_impl_frame_deadline_task_.IsCancelled();
-  }
   bool ImplLatencyTakesPriority() const {
     return state_machine_.ImplLatencyTakesPriority();
   }