Make webkit_user_agent a standalone gyp

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 23 matching lines @@
         '../sync/sync.gyp:sync',
         '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
         '../third_party/libusb/libusb.gyp:libusb',
         '../third_party/re2/re2.gyp:re2',
         '../ui/base/strings/ui_strings.gyp:ui_strings',
         '../ui/ui.gyp:ui',
         '../ui/ui.gyp:ui_resources',
+        '../webkit/common/user_agent/webkit_user_agent.gyp:user_agent',
         '../webkit/support/webkit_support.gyp:glue',
-        '../webkit/support/webkit_support.gyp:user_agent',
         '../webkit/support/webkit_support.gyp:webkit_base',
         '../webkit/support/webkit_support.gyp:webkit_resources',
         '../webkit/support/webkit_support.gyp:webkit_storage',
       ],
       'include_dirs': [
         '..',
         '<(INTERMEDIATE_DIR)',
       ],
       'sources': [
         # All .cc, .h, .m, and .mm files under browser/extensions except for
@@ skipping 918 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/chromeos/contacts',
             'proto_out_dir': 'chrome/browser/chromeos/contacts',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],  # 'chromeos=1'
   ],  # 'conditions'
 }