Implement ui::ClipboardMus.

ui/base/ui_base.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': [
     {
@@ skipping 105 matching lines @@
         'clipboard/clipboard_mac.mm',
         'clipboard/clipboard_types.h',
         'clipboard/clipboard_util_mac.h',
         'clipboard/clipboard_util_mac.mm',
         'clipboard/clipboard_util_win.cc',
         'clipboard/clipboard_util_win.h',
         'clipboard/clipboard_win.cc',
         'clipboard/clipboard_win.h',
         'clipboard/custom_data_helper.cc',
         'clipboard/custom_data_helper.h',
-        'clipboard/custom_data_helper_linux.cc',
         'clipboard/custom_data_helper_mac.mm',
         'clipboard/scoped_clipboard_writer.cc',
         'clipboard/scoped_clipboard_writer.h',
         'cocoa/animation_utils.h',
         'cocoa/appkit_utils.h',
         'cocoa/appkit_utils.mm',
         'cocoa/base_view.h',
         'cocoa/base_view.mm',
         'cocoa/cocoa_base_utils.h',
         'cocoa/cocoa_base_utils.mm',
@@ skipping 630 matching lines @@
            ],
            'variables': {
              'jni_gen_package': 'ui',
            },
            'includes': [ '../../build/jni_generator.gypi' ],
          },
        ],
     }],
   ],
 }