Backed out changeset a31f07fbdc2e (bug 1292321) for browser_urlbarOneOffs.js failures a=backout

browser/base/content/urlbarBindings.xml

@@ -1291,7 +1291,6 @@ file, You can obtain one at http://mozilla.org/MPL/2.0/.
                   class="search-one-offs"
                   compact="true"
                   includecurrentengine="true"
-                  disabletab="true"
                   flex="1"/>
       </xul:hbox>
     </content>

browser/components/search/content/search.xml

@@ -1750,8 +1750,7 @@
           if (event.keyCode == KeyEvent.DOM_VK_TAB &&
               !event.altKey &&
               !event.ctrlKey &&
-              !event.metaKey &&
-              this.getAttribute("disabletab") != "true") {
+              !event.metaKey) {
             stopEvent = this.advanceSelection(!event.shiftKey, false, true);
           }