remove ashmem from skia

gyp/images.gyp

 # GYP file for images project.
 {
   'targets': [
     {
       'target_name': 'images',
       'product_name': 'skia_images',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'core.gyp:*',
@@ skipping 130 matching lines @@
              'android_deps.gyp:gif',
              'android_deps.gyp:png',
           ],
           'conditions': [
             [ 'skia_android_framework == 0', {
               'export_dependent_settings': [
                 'android_deps.gyp:png'
               ],
             }],
           ],
-        },{ #else if skia_os != android
-          'sources!': [
-            '../src/images/SkImageRef_ashmem.h',
-            '../src/images/SkImageRef_ashmem.cpp',
-          ],
         }],
         [ 'skia_os == "chromeos"', {
           'dependencies': [
              'chromeos_deps.gyp:gif',
              'libpng.gyp:libpng',
           ],
         }],
         [ 'skia_os == "ios"', {
            'include_dirs': [
              '../include/utils/mac',
            ],
         }],
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../include/images',
         ],
       },
     },
   ],
 }