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

runtime/lib/double_patch.dart

Index: runtime/lib/double_patch.dart
diff --git a/runtime/lib/double_patch.dart b/runtime/lib/double_patch.dart
index 8fb5560870fae22fac6b74615227245feb4505a6..9e2abeb4ece9d7ee80a7404bca87f8e635038d55 100644
--- a/runtime/lib/double_patch.dart
+++ b/runtime/lib/double_patch.dart
@@ -39,11 +39,11 @@ patch class double {
   }
 
   /* 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;
   }