Make win_aura work without ash.

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 417 matching lines @@
           ],
         }],
         ['use_aura==1', {
           'sources/': [
             ['exclude', 'gfx/gtk_'],
             ['exclude', 'gfx/gtk_util.cc'],
             ['exclude', 'gfx/gtk_util.h'],
             ['exclude', 'gfx/screen_gtk.cc'],
             ['exclude', 'gfx/screen_win.cc'],
             ['exclude', 'base/dragdrop/drag_utils_win.cc'],
-            ['exclude', 'base/view_prop.cc'],
-            ['exclude', 'base/view_prop.h'],
             ['exclude', 'base/win/mouse_wheel_util.cc'],
             ['exclude', 'base/win/mouse_wheel_util.h'],
             ['exclude', 'base/work_area_watcher_observer.h'],
             ['exclude', 'base/x/active_window_watcher_x.cc'],
             ['exclude', 'base/x/active_window_watcher_x.h'],
             ['exclude', 'base/x/active_window_watcher_x_observer.h'],
             ['exclude', 'base/x/root_window_property_watcher_x.cc'],
             ['exclude', 'base/x/root_window_property_watcher_x.h'],
             ['exclude', 'base/x/work_area_watcher_x.cc'],
             ['exclude', 'base/x/work_area_watcher_x.h'],
@@ skipping 136 matching lines @@
             },
           },
           'link_settings': {
             'libraries': [
               '-limm32.lib',
               '-ld2d1.lib',
               '-loleacc.lib',
             ],
           },
         },{  # OS!="win"
+          'conditions': [
+            ['use_aura==0', {
+              'sources!': [
+                'base/view_prop.cc',
+                'base/view_prop.h',
+              ],
+            }],
+          ],
           'sources!': [
             'base/dragdrop/drag_source.cc',
             'base/dragdrop/drag_source.h',
             'base/dragdrop/drag_drop_types.h',
             'base/dragdrop/drop_target.cc',
             'base/dragdrop/drop_target.h',
             'base/dragdrop/os_exchange_data.cc',
-            'base/view_prop.cc',
-            'base/view_prop.h',
             'gfx/native_theme_win.cc',
             'gfx/native_theme_win.h',
           ],
           'sources/': [
             ['exclude', '^base/win/*'],
           ],
         }],
         ['OS=="mac"', {
           'sources!': [
             'base/dragdrop/drag_utils.cc',
@@ skipping 123 matching lines @@
                 'shutil.copyfile(\'<(ui_copy_target)\', \'<(ui_copy_dest)\'); ' \
                 'os.chmod(\'<(ui_copy_dest)\', 0700)'
               ]
             }
           ],
         },
       ],
     }],
   ],
 }