Mac: Remove dead IOSurface code

ui/surface/surface.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,
   },
   'target_defaults': {
     'conditions': [
       ['use_x11 == 1', {
         'include_dirs': [
           '../../third_party/khronos',
         ],
       }],
-      ['OS == "mac"', {
-        # Required by accelerated_surface_mac.cc.
-        'link_settings': {
-          'libraries': [
-            '$(SDKROOT)/System/Library/Frameworks/IOSurface.framework',
-            '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
-          ],
-        },
-      }],
     ],
   },
   'targets': [
     {
       'target_name': 'surface',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../skia/skia.gyp:skia',
         '../base/ui_base.gyp:ui_base',
         '../gfx/gfx.gyp:gfx_geometry',
         '../gl/gl.gyp:gl',
       ],
       'sources': [
-        'accelerated_surface_mac.cc',
-        'accelerated_surface_mac.h',
         'surface_export.h',
         'transport_dib.cc',
         'transport_dib.h',
         'transport_dib_posix.cc',
         'transport_dib_win.cc',
       ],
       'defines': [
         'SURFACE_IMPLEMENTATION',
       ],
     },
   ],
 }