replace etc1_pixel_ref with skia version (SkMallocPixelRef)

cc/cc.gyp

 # Copyright (c) 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 284 matching lines @@
         'quads/tile_draw_quad.cc',
         'quads/tile_draw_quad.h',
         'quads/yuv_video_draw_quad.cc',
         'quads/yuv_video_draw_quad.h',
         'resources/bitmap_content_layer_updater.cc',
         'resources/bitmap_content_layer_updater.h',
         'resources/bitmap_skpicture_content_layer_updater.cc',
         'resources/bitmap_skpicture_content_layer_updater.h',
         'resources/content_layer_updater.cc',
         'resources/content_layer_updater.h',
-        'resources/etc1_pixel_ref.cc',
-        'resources/etc1_pixel_ref.h',
         'resources/image_layer_updater.cc',
         'resources/image_layer_updater.h',
         'resources/image_raster_worker_pool.cc',
         'resources/image_raster_worker_pool.h',
         'resources/layer_painter.h',
         'resources/layer_quad.cc',
         'resources/layer_quad.h',
         'resources/layer_tiling_data.cc',
         'resources/layer_tiling_data.h',
         'resources/layer_updater.cc',
@@ skipping 120 matching lines @@
         'trees/thread_proxy.cc',
         'trees/thread_proxy.h',
         'trees/tree_synchronizer.cc',
         'trees/tree_synchronizer.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }