[Mac/GN] Add BUILD.gn file for //chrome/tools/mac_helpers.

chrome/chrome.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,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 305 matching lines @@
           ],  # 'actions'
         },
         {
           'target_name': 'infoplist_strings_tool',
           'type': 'executable',
           'variables': { 'enable_wexit_time_destructors': 1, },
           'dependencies': [
             'chrome_resources.gyp:chrome_strings',
             '../base/base.gyp:base',
             '../ui/base/ui_base.gyp:ui_data_pack',
-            '../ui/gfx/gfx.gyp:gfx',
-            '../ui/gfx/gfx.gyp:gfx_geometry',
           ],
           'include_dirs': [
             '<(grit_out_dir)',
           ],
           'sources': [
             'tools/mac_helpers/infoplist_strings_util.mm',
           ],
         },
       ],  # targets
     }],  # OS=="mac"
@@ skipping 418 matching lines @@
                 # expired. crbug.com/577698
                 '../components/components.gyp:startup_metric_utils_common',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }