views/mus: Have explicit ownership of views::WindowManagerConnection.

chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h

Index: chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h
diff --git a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h
index 53320268dd976ac4ea694f6850693ac992d6bed2..6cd1b8ba522623a65cbade5eca361da5a3a6d2a5 100644
--- a/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h
+++ b/chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h
@@ -12,6 +12,7 @@
 
 namespace views {
 class ViewsDelegate;
+class WindowManagerConnection;
 }
 
 #if defined(USE_AURA)
@@ -36,6 +37,9 @@ class ChromeBrowserMainExtraPartsViews : public ChromeBrowserMainExtraParts {
 #if defined(USE_AURA)
   std::unique_ptr<wm::WMState> wm_state_;
 #endif
+#if defined(USE_AURA) && defined(MOJO_SHELL_CLIENT)
+  std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;
+#endif
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainExtraPartsViews);
 };