Remove Resource class and support functions.

tests/try/poi/serialize_test.dart

 // 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 file.
 
 /// Test that poi.dart can serialize a scope.
 
 library trydart.serialize_test;
 
 import 'dart:io' show
     Platform;
@@ skipping 514 matching lines @@
   },
   {
     "name": "Match",
     "kind": "class"
   },
   {
     "name": "RegExp",
     "kind": "class"
   },
   {
-    "name": "Resource",
-    "kind": "class"
-  },
-  {
     "name": "Set",
     "kind": "class"
   },
   {
     "name": "Sink",
     "kind": "class"
   },
   {
     "name": "StackTrace",
     "kind": "class"
@@ skipping 58 matching lines @@
       "name": "noSuchMethod",
       "kind": "function",
       "type": "(Invocation) -> dynamic"
     },
     {
       "name": "runtimeType",
       "kind": "getter"
     }
   ]
 };