Changed names of parameters of double.parse in patches to match change in external signature.

runtime/lib/double_patch.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.
 // Dart core library.
 
 // VM implementation of double.
 
 patch class double {
 
   static double _native_parse(_OneByteString string) native "Double_parse";
@@ skipping 21 matching lines @@
       }
       oneByteString = s;
     } else {
       oneByteString = str;
     }
 
     return _native_parse(oneByteString);
   }
 
   /* patch */ static double parse(String str,
-                                  [double handleError(String str)]) {
+                                  [double onError(String str)]) {
     var result = _parse(str);
     if (result == null) {
-      if (handleError == null) throw new FormatException(str);
-      return handleError(str);
+      if (onError == null) throw new FormatException(str);
+      return onError(str);
     }
     return result;
   }
 }