Bug 78320 javascript strict warnings and error in urlbarBindings.xml

patch by ajvincent@juno.com r=brade sr=jst

xpfe/browser/resources/content/urlbarBindings.xml

@@ -228,7 +228,7 @@
             if (ds) {
               var res = rdf.GetResource(defaultEngine);
               try {
-                 searchBarUrl = this.readRDFString(ds, res, kNC_searchBarUrl);
+                var searchBarUrl = this.readRDFString(ds, res, kNC_searchBarUrl);
               } catch(ex) {
                 searchBarUrl = null;
               }