Changes URI encoding so that the hex letters are capitalized,

which is important in oAuth.  According to rfc3986:

 2.1.  Percent-Encoding
  [...]
  If two URIs
  differ only in the case of hexadecimal digits used in percent-encoded
  octets, they are equivalent.  For consistency, URI producers and
  normalizers should use uppercase hexadecimal digits for all percent-
  encodings.

js/rhino/src/org/mozilla/javascript/NativeGlobal.java

@@ -607,7 +607,7 @@ public class NativeGlobal implements Serializable, IdFunctionCall
 
     private static char toHexChar(int i) {
         if (i >> 4 != 0) Kit.codeBug();
-        return (char)((i < 10) ? i + '0' : i - 10 + 'a');
+        return (char)((i < 10) ? i + '0' : i - 10 + 'A');
     }
 
     private static int unHex(char c) {