--- chrome/test/testing_browser_process.h
+++ chrome/test/testing_browser_process.h
@@ -44,7 +44,7 @@ class TestingBrowserProcess : public BrowserProcess {
     return NULL;
   }
 
-#if defined(OS_LINUX)
+#if defined(USE_X11)
   virtual base::Thread* background_x11_thread() {
     return NULL;
   }
diff --git chrome/test/testing_profile.cc chrome/test/testing_profile.cc
index b718773..34b3274 100644