[Mac] Use Core Graphics to draw the close button used within tabs, infobars, ...

chrome/chrome_dll.gypi

 # Copyright (c) 2009 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.
 {
   'target_defaults': {
     'variables': {
       'chrome_dll_target': 0,
     },
     'target_conditions': [
       ['chrome_dll_target==1', {
@@ skipping 228 matching lines @@
                 'app/nibs/ReportBug.xib',
                 'app/nibs/SaveAccessoryView.xib',
                 'app/nibs/SadTab.xib',
                 'app/nibs/SyncCustomize.xib',
                 'app/nibs/TabContents.xib',
                 'app/nibs/TabView.xib',
                 'app/nibs/TaskManager.xib',
                 'app/nibs/Toolbar.xib',
                 'app/theme/back_Template.pdf',
                 'app/theme/chevron.png',  # TODO(jrg): get and use a pdf version
-                'app/theme/close_bar.pdf',
-                'app/theme/close_bar_h.pdf',
-                'app/theme/close_bar_p.pdf',
                 'app/theme/find_next_Template.pdf',
                 'app/theme/find_prev_Template.pdf',
                 'app/theme/forward_Template.pdf',
                 'app/theme/home_Template.pdf',
                 'app/theme/menu_chrome_rtl_Template.pdf',
                 'app/theme/menu_chrome_Template.pdf',
                 'app/theme/menu_hierarchy_arrow.pdf',
                 'app/theme/menu_overflow_down.pdf',
                 'app/theme/menu_overflow_up.pdf',
                 'app/theme/menu_page_rtl_Template.pdf',
@@ skipping 337 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },  # target chrome_dll
       ],
     }],
   ],
 }