Revert 109528 - Use XFixes to update the clipboard sequence number.

ui/ui.gyp

 # Copyright (c) 2011 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,
   },
   'target_defaults': {
     'conditions': [
@@ skipping 338 matching lines @@
           ],
         }],
         ['use_glib == 1', {
           'dependencies': [
             # font_gtk.cc uses fontconfig.
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:glib',
             '../build/linux/system.gyp:pangocairo',
             '../build/linux/system.gyp:x11',
             '../build/linux/system.gyp:xext',
-            '../build/linux/system.gyp:xfixes',
           ],
           'sources': [
             'gfx/linux_util.cc',
             'gfx/linux_util.h',
           ],
           'link_settings': {
             'libraries': [
               '-lXrender',  # For XRender* function calls in x11_util.cc.
             ],
           },
@@ skipping 250 matching lines @@
                 'shutil.copyfile(\'<(ui_copy_target)\', \'<(ui_copy_dest)\'); ' \
                 'os.chmod(\'<(ui_copy_dest)\', 0700)'
               ]
             }
           ],
         },
       ],
     }],
   ],
 }