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 2d78c9bdf8593e74ee019f3664cf15f83da8d8f9..b124c9ff6ab2d1fc0353595d2a3b9a59a5dcf390 100644
--- a/base/threading/thread_restrictions.h
+++ b/base/threading/thread_restrictions.h
@@ -75,6 +75,10 @@ namespace ui {
 class WindowResizeHelperMac;
 }
 
+namespace views {
+class WindowManagerConnection;
+}
+
 namespace base {
 
 namespace android {
@@ -221,6 +225,7 @@ class BASE_EXPORT ThreadRestrictions {
 #if !defined(OFFICIAL_BUILD)
   friend class content::SoftwareOutputDeviceMus;  // Interim non-production code
 #endif
+  friend class views::WindowManagerConnection;
 // END USAGE THAT NEEDS TO BE FIXED.
 
 #if ENABLE_THREAD_RESTRICTIONS