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

tests/corelib/uri_test.dart

Index: tests/corelib/uri_test.dart
diff --git a/tests/corelib/uri_test.dart b/tests/corelib/uri_test.dart
index a9166be3c11d0dd205f6be6fbfef99b9e504cc00..3d24e2daa9bea2b13edaf0f5a1804216a5b67247 100644
--- a/tests/corelib/uri_test.dart
+++ b/tests/corelib/uri_test.dart
@@ -32,6 +32,11 @@ testUri(String uriText, bool isAbsolute) {
     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) {