[zoom bubble] Fix my stupidity and restore the proper host handling

chrome/browser/ui/zoom/zoom_controller.h

Index: chrome/browser/ui/zoom/zoom_controller.h
diff --git a/chrome/browser/ui/zoom/zoom_controller.h b/chrome/browser/ui/zoom/zoom_controller.h
index f7aed95ba46d1245da291190d5523d918b8fa379..f4685722e864b1f97baaf57711ad5243995dd4d5 100644
--- a/chrome/browser/ui/zoom/zoom_controller.h
+++ b/chrome/browser/ui/zoom/zoom_controller.h
@@ -7,6 +7,7 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
 #include "base/prefs/public/pref_observer.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "content/public/browser/notification_observer.h"
@@ -73,6 +74,10 @@ class ZoomController : public content::NotificationObserver,
   // Observer receiving notifications on state changes.
   ZoomObserver* observer_;
 
+  FRIEND_TEST_ALL_PREFIXES(ZoomControllerTest, DidNavigateMainFrame);
+  FRIEND_TEST_ALL_PREFIXES(ZoomControllerTest, Observe);
+  FRIEND_TEST_ALL_PREFIXES(ZoomControllerTest, OnPreferenceChanged);
+
   DISALLOW_COPY_AND_ASSIGN(ZoomController);
 };