Remove parts of //cc we aren't using

cc/output/compositor_frame_ack.h

 // 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 "base/memory/scoped_ptr.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 {
+class CompositorFrameAck {
  public:
   CompositorFrameAck();
   ~CompositorFrameAck();
 
   ReturnedResourceArray resources;
   scoped_ptr<GLFrameData> gl_frame_data;
   unsigned last_software_frame_id;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CompositorFrameAck);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_COMPOSITOR_FRAME_ACK_H_