Delete canvas_win.cc since it is no longer used.

ui/ui.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,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 305 matching lines @@
         'gfx/blit.h',
         'gfx/canvas.cc',
         'gfx/canvas.h',
         'gfx/canvas_android.cc',
         'gfx/canvas_linux.cc',
         'gfx/canvas_mac.mm',
         'gfx/canvas_paint.h',
         'gfx/canvas_paint_win.cc',
         'gfx/canvas_skia.cc',
         'gfx/canvas_skia_paint.h',
-        'gfx/canvas_win.cc',
         'gfx/codec/jpeg_codec.cc',
         'gfx/codec/jpeg_codec.h',
         'gfx/codec/png_codec.cc',
         'gfx/codec/png_codec.h',
         'gfx/color_analysis.cc',
         'gfx/color_analysis.h',
         'gfx/color_utils.cc',
         'gfx/color_utils.h',
         'gfx/display.cc',
         'gfx/display.h',
@@ skipping 99 matching lines @@
         'ui_controls/ui_controls_win.cc',
       ],
       'conditions': [
         # TODO(asvitkine): Switch all platforms to use canvas_skia.cc.
         #                  http://crbug.com/105550
         ['use_canvas_skia==1', {
           'sources!': [
             'gfx/canvas_android.cc',
             'gfx/canvas_linux.cc',
             'gfx/canvas_mac.mm',
-            'gfx/canvas_win.cc',
           ],
         }, {  # use_canvas_skia!=1
           'sources!': [
             'gfx/canvas_skia.cc',
           ],
         }],
         ['use_aura==1', {
           'sources/': [
             ['exclude', 'gfx/gtk_'],
             ['exclude', 'gfx/gtk_util.cc'],
@@ skipping 287 matching lines @@
                 'shutil.copyfile(\'<(ui_copy_target)\', \'<(ui_copy_dest)\'); ' \
                 'os.chmod(\'<(ui_copy_dest)\', 0700)'
               ]
             }
           ],
         },
       ],
     }],
   ],
 }