Removes a couple more functions from WmWindow

ash/wm/workspace/workspace_layout_manager.cc

Index: ash/wm/workspace/workspace_layout_manager.cc
diff --git a/ash/wm/workspace/workspace_layout_manager.cc b/ash/wm/workspace/workspace_layout_manager.cc
index 9eb5c6c6a79857f6e3008852d666f9efc6fabb5c..2017cdd216f015989f8b0b9779f80e484add6898 100644
--- a/ash/wm/workspace/workspace_layout_manager.cc
+++ b/ash/wm/workspace/workspace_layout_manager.cc
@@ -374,7 +374,7 @@ void WorkspaceLayoutManager::UpdateFullscreenState() {
   // only windows in the default workspace container will go fullscreen but
   // this should really be tracked by the RootWindowController since
   // technically any container could get a fullscreen window.
-  if (window_->GetShellWindowId() != kShellWindowId_DefaultContainer)
+  if (window_->aura_window()->id() != kShellWindowId_DefaultContainer)
     return;
   bool is_fullscreen = wm::GetWindowForFullscreenMode(window_) != nullptr;
   if (is_fullscreen != is_fullscreen_) {