Update sync protos to use the new shared protoc gyp rules

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'dependencies': [
         'app/policy/cloud_policy_codegen.gyp:policy',
-        'browser/sync/protocol/sync_proto.gyp:sync_proto_cpp',
+        'browser/sync/protocol/sync_proto.gyp:sync_proto',
         'chrome_extra_resources',
         'chrome_resources',
         'chrome_strings',
         'common',
         'common_net',
         'debugger',
         'in_memory_url_index_cache_proto_cpp',
         'installer_util',
         'platform_locale_settings',
         'profile_import',
@@ skipping 5000 matching lines @@
               # weak imports in dependents, who still must #include
               # closure_blocks_leopard_compat.h to get weak imports.
               'type': 'none',
             }],
           ],
         },
       ],
     }],
   ],
 }