Fix another build break that didn't show up on the try bots.

TBR=darin
BUG=25354
Review URL: http://codereview.chromium.org/329035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30167 0039d316-1c4b-4281-b951-d872f2087c98

chrome_frame/test/net/fake_external_tab.cc

@@ -279,7 +279,7 @@ void CFUrlRequestUnittestRunner::RunMainUIThread() {
   DCHECK(MessageLoop::current()->type() == MessageLoop::TYPE_UI);
 
   // Register the main thread by instantiating it, but don't call any methods.
-  ChromeThread main_thread;
+  ChromeThread main_thread(ChromeThread::UI, MessageLoop::current());
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
 
   MessageLoop::current()->Run();