remove cruft from tests

browser/base/content/test/browser_bug356571.js

@@ -1,12 +1,8 @@
 // Bug 356571 - loadOneOrMoreURIs gives up if one of the URLs has an unknown protocol
 
-const Cc = Components.classes;
-const Ci = Components.interfaces;
 const Cr = Components.results;
 const Cm = Components.manager;
 
-Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
-
 // Set to true when docShell alerts for unknown protocol error
 var didFail = false;
 

browser/base/content/test/browser_bug441778.js

@@ -35,8 +35,6 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-
 /*
  * Test the fix for bug 441778 to ensure site-specific page zoom doesn't get
  * modified by sub-document loads of content from a different domain.
@@ -53,9 +51,8 @@ function test() {
   let zoomLevel;
 
   // Prepare the test tab
-  let testTab = gBrowser.addTab();
-  gBrowser.selectedTab = testTab;
-  let testBrowser = gBrowser.getBrowserForTab(testTab);
+  gBrowser.selectedTab = gBrowser.addTab();
+  let testBrowser = gBrowser.selectedBrowser;
 
   let finishTest = function() {
     testBrowser.removeProgressListener(progressListener);