fix(style_url_resolver): fix data: url resolution

modules/angular2/test/facade/lang_spec.ts

@@ -24,6 +24,14 @@ export function main() {
 
       expect(indexes).toEqual([1, 4, 8, 9]);
     });
+
+    it('should reset before it is reused', () => {
+      var re = /^['"]/g;
+      var str = "'";
+      expect(RegExpWrapper.test(re, str)).toEqual(true);
+      // If not reset, the second attempt to test results in false
+      expect(RegExpWrapper.test(re, str)).toEqual(true);
+    });
   });
 
   describe('const', () => {