replace etc1_pixel_ref with skia version (SkMallocPixelRef)

cc/resources/etc1_pixel_ref.h

-// Copyright 2013 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_RESOURCES_ETC1_PIXEL_REF_H_
-#define CC_RESOURCES_ETC1_PIXEL_REF_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "cc/base/cc_export.h"
-#include "third_party/skia/include/core/SkPixelRef.h"
-
-namespace cc {
-
-class CC_EXPORT ETC1PixelRef : public SkPixelRef {
- public:
-  // Takes ownership of pixels.
-  ETC1PixelRef(const SkImageInfo& info, size_t rowBytes,
-               scoped_ptr<uint8_t[]> pixels);
-  virtual ~ETC1PixelRef();
-
-  // SK_DECLARE_UNFLATTENABLE_OBJECT
-  virtual Factory getFactory() const OVERRIDE;
-
- protected:
-  // Implementation of SkPixelRef.
-#ifdef SK_SUPPORT_LEGACY_ONLOCKPIXELS
-  virtual void* onLockPixels(SkColorTable** color_table) OVERRIDE;
-#endif
-  virtual bool onNewLockPixels(LockRec* rec) OVERRIDE;
-  virtual void onUnlockPixels() OVERRIDE;
-
- private:
-  size_t rowBytes_;
-  scoped_ptr<uint8_t[]> pixels_;
-
-  DISALLOW_COPY_AND_ASSIGN(ETC1PixelRef);
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_ETC1_PIXEL_REF_H_