[cc] Remove remaining_frames from BeginFrameAck.

cc/surfaces/display_scheduler.cc

Index: cc/surfaces/display_scheduler.cc
diff --git a/cc/surfaces/display_scheduler.cc b/cc/surfaces/display_scheduler.cc
index 1e91f5fd43004ad3867b92a21595f9fefc0ec044..1d99239756180426b90f098859d70bf4885c10ac 100644
--- a/cc/surfaces/display_scheduler.cc
+++ b/cc/surfaces/display_scheduler.cc
@@ -366,7 +366,7 @@ void DisplayScheduler::DidFinishFrame(bool did_draw) {
   // TODO(eseckler): Determine and set correct |ack.latest_confirmed_frame|.
   BeginFrameAck ack(current_begin_frame_args_.source_id,
                     current_begin_frame_args_.sequence_number,
-                    current_begin_frame_args_.sequence_number, 0, did_draw);
+                    current_begin_frame_args_.sequence_number, did_draw);
   begin_frame_source_->DidFinishFrame(this, ack);
 }