Prevents double-escaping of characters by keeping Window.createUrlBuilder() consistent with UrlBuilder.buildString(). Review at http://gwt-code-reviews.appspot.com/1528805 Review by: jlabanca@google.com git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10570 8db76d5a-ed1c-0410-87a9-c151d255dfc7