cleans up sdk patching so we no longer have unresolved names

test/generated_sdk/lib/convert/convert.dart

 // Copyright (c) 2013, 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.
 
 /**
  *
  * Encoders and decoders for converting between different data representations,
  * including JSON and UTF-8.
  *
  * In addition to converters for common data representations, this library
@@ skipping 51 matching lines @@
 part 'chunked_conversion.dart';
 part 'codec.dart';
 part 'converter.dart';
 part 'encoding.dart';
 part 'html_escape.dart';
 part 'json.dart';
 part 'latin1.dart';
 part 'line_splitter.dart';
 part 'string_conversion.dart';
 part 'utf.dart';
+import 'dart:_js_helper' show patch;
+import 'dart:_foreign_helper' show JS;
+import 'dart:_interceptors' show JSExtendableArray;
 import 'dart:_internal' show MappedIterable, ListIterable;
 import 'dart:collection' show Maps, LinkedHashMap;
 
 /**
  * Walks the raw JavaScript value [json], replacing JavaScript Objects with
  * Maps. [json] is expected to be freshly allocated so elements can be replaced
  * in-place.
  */
 _convertJsonToDart(json, reviver(key, value)) {
   assert(reviver != null);
@@ skipping 320 matching lines @@
   void close() {
     super.close();
     StringBuffer buffer = _stringSink;
     String accumulated = buffer.toString();
     buffer.clear();
     Object decoded = _parseJson(accumulated, _reviver);
     _sink.add(decoded);
     _sink.close();
   }
 }