Simplify accelerated paint and remove windows CanvasSkiaPaint

ui/gfx/gfx.gyp

 # Copyright (c) 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 114 matching lines @@
         'animation/tween.cc',
         'animation/tween.h',
         'blit.cc',
         'blit.h',
         'break_list.h',
         'canvas.cc',
         'canvas.h',
         'canvas_notimplemented.cc',
         'canvas_paint_mac.h',
         'canvas_paint_mac.mm',
-        'canvas_paint_win.cc',
-        'canvas_paint_win.h',
         'canvas_skia.cc',
         'canvas_skia_paint.h',
         'codec/jpeg_codec.cc',
         'codec/jpeg_codec.h',
         'codec/png_codec.cc',
         'codec/png_codec.h',
         'color_analysis.cc',
         'color_analysis.h',
         'color_profile.cc',
         'color_profile.h',
@@ skipping 345 matching lines @@
          ],
          'variables': {
            'jni_gen_package': 'ui/gfx',
          },
          'includes': [ '../../build/jni_generator.gypi' ],
        },
      ],
     }],
   ],
 }