[cc] Remove remaining_frames from BeginFrameAck.

cc/surfaces/display_scheduler.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/surfaces/display_scheduler.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/stl_util.h"
@@ skipping 348 matching lines @@
   DCHECK(inside_begin_frame_deadline_interval_);
 
   bool did_draw = AttemptDrawAndSwap();
   DidFinishFrame(did_draw);
 }
 
 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);
 }
 
 void DisplayScheduler::DidSwapBuffers() {
   pending_swaps_++;
   TRACE_EVENT_ASYNC_BEGIN1("cc", "DisplayScheduler:pending_swaps", this,
                            "pending_frames", pending_swaps_);
 }
 
 void DisplayScheduler::DidReceiveSwapBuffersAck() {
   pending_swaps_--;
   TRACE_EVENT_ASYNC_END1("cc", "DisplayScheduler:pending_swaps", this,
                          "pending_frames", pending_swaps_);
   ScheduleBeginFrameDeadline();
 }
 
 }  // namespace cc