[cc] Remove remaining_frames from BeginFrameAck.

cc/output/begin_frame_args.cc

Index: cc/output/begin_frame_args.cc
diff --git a/cc/output/begin_frame_args.cc b/cc/output/begin_frame_args.cc
index bf41afa277dafb8600b530df9f9ee7f084db09dd..ae595450857d753617200f8b5fc839c1a1f5334a 100644
--- a/cc/output/begin_frame_args.cc
+++ b/cc/output/begin_frame_args.cc
@@ -111,18 +111,15 @@ BeginFrameAck::BeginFrameAck()
     : sequence_number(BeginFrameArgs::kInvalidFrameNumber),
       latest_confirmed_sequence_number(BeginFrameArgs::kInvalidFrameNumber),
       source_id(0),
-      remaining_frames(0),
       has_damage(false) {}
 
 BeginFrameAck::BeginFrameAck(uint32_t source_id,
                              uint64_t sequence_number,
                              uint64_t latest_confirmed_sequence_number,
-                             uint32_t remaining_frames,
                              bool has_damage)
     : sequence_number(sequence_number),
       latest_confirmed_sequence_number(latest_confirmed_sequence_number),
       source_id(source_id),
-      remaining_frames(remaining_frames),
       has_damage(has_damage) {
   DCHECK_LT(BeginFrameArgs::kInvalidFrameNumber, sequence_number);
 }
@@ -131,7 +128,7 @@ BeginFrameAck::BeginFrameAck(uint32_t source_id,
 BeginFrameAck BeginFrameAck::CreateManualAckWithDamage() {
   return BeginFrameAck(BeginFrameArgs::kManualSourceId,
                        BeginFrameArgs::kStartingFrameNumber,
-                       BeginFrameArgs::kInvalidFrameNumber, 0, true);
+                       BeginFrameArgs::kInvalidFrameNumber, true);
 }
 
 }  // namespace cc