Revert "Switch libraries to using new tags."

sdk/lib/uri/encode_decode.dart

 // Copyright (c) 2012, 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.
 
-part of dart.uri;
-
 /**
  * Javascript-like URI encode/decode functions.
  * The documentation here borrows heavily from the original Javascript
  * doumentation on MDN at:
  * https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects
  */
 
 /**
  * A JavaScript-like URI encoder. Encodes Uniform Resource Identifier [uri]
  * by replacing each instance of certain characters by one, two, three, or four
@@ skipping 124 matching lines @@
         if (i == text.length)
           break;
         ch = text[i];
       }
       result.add(decodeUtf8(codepoints));
     }
   }
   return result.toString();
 }