cc: Dedup IPCs to return resources to client

cc/output/compositor_frame_ack.h

Index: cc/output/compositor_frame_ack.h
diff --git a/cc/output/compositor_frame_ack.h b/cc/output/compositor_frame_ack.h
deleted file mode 100644
index e5fb2410f872b9af5edd0b1b433a4cfd96fe85c7..0000000000000000000000000000000000000000
--- a/cc/output/compositor_frame_ack.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2012 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.
-
-#ifndef CC_OUTPUT_COMPOSITOR_FRAME_ACK_H_
-#define CC_OUTPUT_COMPOSITOR_FRAME_ACK_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "cc/base/cc_export.h"
-#include "cc/output/gl_frame_data.h"
-#include "cc/resources/returned_resource.h"
-
-namespace cc {
-
-class CC_EXPORT CompositorFrameAck {
- public:
-  CompositorFrameAck();
-  ~CompositorFrameAck();
-
-  ReturnedResourceArray resources;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(CompositorFrameAck);
-};
-
-}  // namespace cc
-
-#endif  // CC_OUTPUT_COMPOSITOR_FRAME_ACK_H_