Revert of Revert of Move service_discovery_client_impl.* into chrome/common.

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 342 matching lines @@
                 '../third_party/libexif/libexif.gyp:libexif',
               ],
               'sources/': [
                 ['exclude', '^utility/importer/'],
                 ['exclude', '^utility/media_galleries/'],
                 ['exclude', '^utility/profile_import_handler\.cc'],
               ],
             }],
             ['enable_mdns == 1', {
               'sources': [
-                'utility/local_discovery/service_discovery_client_impl.cc',
-                'utility/local_discovery/service_discovery_client_impl.h',
                 'utility/local_discovery/service_discovery_message_handler.cc',
                 'utility/local_discovery/service_discovery_message_handler.h',
               ]
             }],
           ],
           # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
           'msvs_disabled_warnings': [ 4267, ],
         },
       ],
     }],  # OS!="ios"
@@ skipping 706 matching lines @@
               'sources': [
                 'service/cloud_print/print_system_dummy.cc',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }