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

ui/views/mus/window_manager_connection.cc

Index: ui/views/mus/window_manager_connection.cc
diff --git a/ui/views/mus/window_manager_connection.cc b/ui/views/mus/window_manager_connection.cc
index a42f9ddcf3961f6e2d814e9f2fdace96c81d6bb5..65e2804cf8abd962fcd8a00a8afaf444098d4e12 100644
--- a/ui/views/mus/window_manager_connection.cc
+++ b/ui/views/mus/window_manager_connection.cc
@@ -6,7 +6,6 @@
 
 #include "base/lazy_instance.h"
 #include "base/threading/thread_local.h"
-#include "base/threading/thread_restrictions.h"
 #include "components/mus/public/cpp/window_tree_connection.h"
 #include "components/mus/public/interfaces/window_tree.mojom.h"
 #include "mojo/application/public/cpp/application_connection.h"
@@ -112,8 +111,6 @@
   window_manager_->OpenWindow(
       window_tree_client.Pass(),
       mojo::Map<mojo::String, mojo::Array<uint8_t>>::From(properties));
-
-  base::ThreadRestrictions::ScopedAllowWait allow_wait;
   mus::WindowTreeConnection* window_tree_connection =
       mus::WindowTreeConnection::Create(
           this, window_tree_client_request.Pass(),