With the change in the constructor for the ChromeThread class, we are seeing ...

chrome_frame/test/net/fake_external_tab.cc

Index: chrome_frame/test/net/fake_external_tab.cc
===================================================================
--- chrome_frame/test/net/fake_external_tab.cc	(revision 30327)
+++ chrome_frame/test/net/fake_external_tab.cc	(working copy)
@@ -146,7 +146,8 @@
   EXPECT_TRUE(pss_subclass_->Subclass(fake_chrome_.user_data()));
   StartChromeFrameInHostBrowser();
   // Register the main thread by instantiating it, but don't call any methods.
-  main_thread_.reset(new ChromeThread(ChromeThread::UI));
+  main_thread_.reset(new ChromeThread(ChromeThread::UI,
+                                      MessageLoop::current()));
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
 }