Make it easier to test changes to a .icon file.

ui/views/examples/examples.gyp

 # Copyright 2014 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': [
     {
       # GN version: //ui/views/examples
@@ skipping 10 matching lines @@
         '../../gfx/gfx.gyp:gfx_geometry',
         '../../gfx/gfx.gyp:gfx_vector_icons',
         '../../resources/ui_resources.gyp:ui_resources',
         '../../resources/ui_resources.gyp:ui_test_pak',
         '../views.gyp:views',
       ],
       'include_dirs': [
         '../../..',
       ],
       'defines': [
+        'GFX_VECTOR_ICONS_UNSAFE',
         'VIEWS_EXAMPLES_IMPLEMENTATION',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'bubble_example.cc',
         'bubble_example.h',
         'button_example.cc',
         'button_example.h',
         'checkbox_example.cc',
         'checkbox_example.h',
@@ skipping 153 matching lines @@
         }],
         ['OS=="win" and component!="shared_library" and win_use_allocator_shim==1', {
           'dependencies': [
             '<(DEPTH)/base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },  # target_name: views_examples_with_content_exe
   ],
 }