Removes a couple more functions from WmWindow

ash/wm/workspace/phantom_window_controller.cc

Index: ash/wm/workspace/phantom_window_controller.cc
diff --git a/ash/wm/workspace/phantom_window_controller.cc b/ash/wm/workspace/phantom_window_controller.cc
index 143d922987330d1edf0ea60c8f90c6aefd555d79..d334e9ca0e4a38912033afbebd95759b07a83d44 100644
--- a/ash/wm/workspace/phantom_window_controller.cc
+++ b/ash/wm/workspace/phantom_window_controller.cc
@@ -120,7 +120,7 @@ std::unique_ptr<views::Widget> PhantomWindowController::CreatePhantomWidget(
   phantom_widget->SetVisibilityChangedAnimationsEnabled(false);
   WmWindow* phantom_widget_window =
       WmWindow::Get(phantom_widget->GetNativeWindow());
-  phantom_widget_window->SetShellWindowId(kShellWindowId_PhantomWindow);
+  phantom_widget_window->aura_window()->set_id(kShellWindowId_PhantomWindow);
   phantom_widget->SetBounds(bounds_in_screen);
   // TODO(sky): I suspect this is never true, verify that.
   if (phantom_widget_window->GetParent() == window_->GetParent()) {