Fix for uri replace whene uri has fragment. Was adding a second '#'.

tests/corelib/uri_test.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.
 
 library uriTest;
 
 import "package:expect/expect.dart";
 import 'dart:convert';
 
 testUri(String uriText, bool isAbsolute) {
@@ skipping 14 matching lines @@
   Expect.equals(uri.hashCode, uri2.hashCode);
 
   // Test that removeFragment doesn't change anything else.
   if (uri.hasFragment) {
     Expect.equals(Uri.parse(uriText.substring(0, uriText.indexOf('#'))),
                   uri.removeFragment());
   } else {
     Expect.equals(uri,
                   Uri.parse(uriText + "#fragment").removeFragment());
   }
+
+  // Test uri.replace on uri with fragment
+  uri = Uri.parse('http://hello.com/fake#fragment');
+  uri = uri.replace(path: "D/E/E");
+  Expect.stringEquals('http://hello.com/D/E/E#fragment', uri.toString());
 }
 
 testEncodeDecode(String orig, String encoded) {
   var e = Uri.encodeFull(orig);
   Expect.stringEquals(encoded, e);
   var d = Uri.decodeFull(encoded);
   Expect.stringEquals(orig, d);
 }
 
 testEncodeDecodeComponent(String orig, String encoded) {
@@ skipping 813 matching lines @@
 String dump(Uri uri) {
   return "URI: $uri\n"
       "  Scheme:    ${uri.scheme} #${uri.scheme.length}\n"
       "  User-info: ${uri.userInfo} #${uri.userInfo.length}\n"
       "  Host:      ${uri.host} #${uri.host.length}\n"
       "  Port:      ${uri.port}\n"
       "  Path:      ${uri.path} #${uri.path.length}\n"
       "  Query:     ${uri.query} #${uri.query.length}\n"
       "  Fragment:  ${uri.fragment} #${uri.fragment.length}\n";
 }