Bug 812528 - Port speculativeConnect changes to search.xml from bug 804655 and bug 722979. r=Neil

suite/common/search/search.xml

@@ -487,13 +487,16 @@
         var engine = this.currentEngine;
         var connector = Components.classes["@mozilla.org/network/io-service;1"]
                                   .getService(Components.interfaces.nsISpeculativeConnect);
+        var callbacks = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+                              .getInterface(Components.interfaces.nsIWebNavigation)
+                              .QueryInterface(Components.interfaces.nsILoadContext);
         var searchURI = engine.getSubmission("dummy").uri;
-        connector.speculativeConnect(searchURI, null);
+        connector.speculativeConnect(searchURI, callbacks);
 
         if (engine.supportsResponseType(SUGGEST_TYPE)) {
           var suggestURI = engine.getSubmission("dummy", SUGGEST_TYPE).uri;
           if (suggestURI.prePath != searchURI.prePath)
-            connector.speculativeConnect(suggestURI, null);
+            connector.speculativeConnect(suggestURI, callbacks);
         }
       ]]></handler>
     </handlers>