Revert of views/mus: Fix showing menu in chrome in mus.

base/threading/thread_restrictions.h

Index: base/threading/thread_restrictions.h
diff --git a/base/threading/thread_restrictions.h b/base/threading/thread_restrictions.h
index 7489ff4daab55880fe892d7b27eaca997f5a1ef6..2d78c9bdf8593e74ee019f3664cf15f83da8d8f9 100644
--- a/base/threading/thread_restrictions.h
+++ b/base/threading/thread_restrictions.h
@@ -73,10 +73,6 @@
 
 namespace ui {
 class WindowResizeHelperMac;
-}
-
-namespace views {
-class WindowManagerConnection;
 }
 
 namespace base {
@@ -224,7 +220,6 @@
   friend class ::NativeBackendKWallet;            // http://crbug.com/125331
 #if !defined(OFFICIAL_BUILD)
   friend class content::SoftwareOutputDeviceMus;  // Interim non-production code
-  friend class views::WindowManagerConnection;
 #endif
 // END USAGE THAT NEEDS TO BE FIXED.