Remove serialization from the try.dartlang.org list of packages, as it's moving to github

site/try/build_try.gyp

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE
 
 {
   'variables' : {
     'script_suffix%': '',
   },
   'conditions' : [
     ['OS=="win"', {
@@ skipping 38 matching lines @@
           '../../pkg/analyzer/lib',
           '../../pkg/args/lib',
           '../../pkg/collection/lib',
           '../../pkg/crypto/lib',
           '../../pkg/http/lib',
           '../../pkg/http_parser/lib',
           '../../pkg/intl/lib',
           '../../pkg/logging/lib',
           '../../pkg/matcher/lib',
           '../../pkg/path/lib',
-          '../../pkg/serialization/lib',
           '../../pkg/stack_trace/lib',
           '../../pkg/string_scanner/lib',
           '../../pkg/unittest/lib',
           '../../pkg/yaml/lib',
         ],
       },
       'actions': [
         {
           'action_name': 'sdk_json',
           'message': 'Creating sdk.json',
@@ skipping 121 matching lines @@
           'files': [
             'app.yaml',
             '<@(try_dart_static_files)',
             '<(SHARED_INTERMEDIATE_DIR)/ssl.appcache',
           ],
         },
       ],
     },
   ],
 }