chromeos: Promotes more from WmShell to Shell

ash/mus/bridge/wm_shell_mus.h

Index: ash/mus/bridge/wm_shell_mus.h
diff --git a/ash/mus/bridge/wm_shell_mus.h b/ash/mus/bridge/wm_shell_mus.h
index fd732937435a72e1349c849e678717a1e234273f..a6bb18797f62c3fc8a0925e57f773aa3e7a9f7e9 100644
--- a/ash/mus/bridge/wm_shell_mus.h
+++ b/ash/mus/bridge/wm_shell_mus.h
@@ -39,7 +39,6 @@ class WmShellMus : public WmShell {
   // If |create_session_state_delegate_stub| is true SessionStateDelegateStub is
   // created. If false, the SessionStateDelegate from Shell is used.
   WmShellMus(WmWindow* primary_root_window,
-             std::unique_ptr<ShellDelegate> shell_delegate,
              WindowManager* window_manager,
              views::PointerWatcherEventRouter* pointer_watcher_event_router,
              bool create_session_state_delegate_stub);