split ui/base/clipboard constants out for split_link

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': [
     'shell_dialogs.gypi',
@@ skipping 65 matching lines @@
         'base/animation/throb_animation.cc',
         'base/animation/throb_animation.h',
         'base/animation/tween.cc',
         'base/animation/tween.h',
         'base/clipboard/clipboard.cc',
         'base/clipboard/clipboard.h',
         'base/clipboard/clipboard_android.cc',
         'base/clipboard/clipboard_android_initialization.h',
         'base/clipboard/clipboard_aura.cc',
         'base/clipboard/clipboard_aurax11.cc',
+        'base/clipboard/clipboard_constants.cc',
         'base/clipboard/clipboard_gtk.cc',
         'base/clipboard/clipboard_mac.mm',
         'base/clipboard/clipboard_sourcetag.h',
         'base/clipboard/clipboard_util_win.cc',
         'base/clipboard/clipboard_util_win.h',
         'base/clipboard/clipboard_win.cc',
         'base/clipboard/custom_data_helper.cc',
         'base/clipboard/custom_data_helper.h',
         'base/clipboard/custom_data_helper_linux.cc',
         'base/clipboard/custom_data_helper_mac.mm',
@@ skipping 902 matching lines @@
               'xcode_settings': {
                 'GCC_SYMBOLS_PRIVATE_EXTERN': 'NO',
               },
             }],
           ],
         },
       ],
     }],
   ],
 }