Renames WmShell to ShellPort

ash/wm_window.h

Index: ash/wm_window.h
diff --git a/ash/wm_window.h b/ash/wm_window.h
index 4b579daf33e3c7e99b33ce6d54df8186314ff685..7ce8e27908150cffa2e9d621ce4dbc3bd3943247 100644
--- a/ash/wm_window.h
+++ b/ash/wm_window.h
@@ -45,7 +45,6 @@ namespace ash {
 class ImmersiveFullscreenController;
 class RootWindowController;
 class WmLayoutManager;
-class WmShell;
 class WmTransientWindowObserver;
 class WmWindowTestApi;
 enum class WmWindowProperty;
@@ -109,9 +108,6 @@ class ASH_EXPORT WmWindow : public aura::WindowObserver,
   const WmWindow* GetRootWindow() const;
   RootWindowController* GetRootWindowController();
 
-  // TODO(sky): fix constness.
-  WmShell* GetShell() const;
-
   // See shell_window_ids.h for list of known ids.
   void SetShellWindowId(int id);
   int GetShellWindowId() const;