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

sdk/lib/core/uri.dart

Index: sdk/lib/core/uri.dart
diff --git a/sdk/lib/core/uri.dart b/sdk/lib/core/uri.dart
index 17f290d14e9be14108050c037aac48ff94348329..b43b3ad0474ac9f63d089f80ef196831297e2993 100644
--- a/sdk/lib/core/uri.dart
+++ b/sdk/lib/core/uri.dart
@@ -4207,7 +4207,7 @@ class _SimpleUri implements Uri {
     if (fragment != null) {
       fragment = _Uri._makeFragment(fragment, 0, fragment.length);
     } else if (_fragmentStart < _uri.length) {
-      fragment = _uri.substring(_fragmentStart);
+      fragment = _uri.substring(_fragmentStart + 1);
     }
 
     return new _Uri._internal(