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

mash/quick_launch/quick_launch_application.h

Index: mash/quick_launch/quick_launch_application.h
diff --git a/mash/quick_launch/quick_launch_application.h b/mash/quick_launch/quick_launch_application.h
index 347c29636f4732ae23078322377e059a5e8ec3a2..cc7c18b7d65ff74e609be700e64ba365317379f6 100644
--- a/mash/quick_launch/quick_launch_application.h
+++ b/mash/quick_launch/quick_launch_application.h
@@ -16,6 +16,7 @@
 namespace views {
 class AuraInit;
 class Widget;
+class WindowManagerConnection;
 }
 
 namespace mash {
@@ -51,6 +52,7 @@ class QuickLaunchApplication
 
   mojo::TracingImpl tracing_;
   std::unique_ptr<views::AuraInit> aura_init_;
+  std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(QuickLaunchApplication);
 };