Removes/promotes functions from WmWindowMus to WmWindowAura

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 fc86876193060fbdd669af561fdba06fa477ce1a..43ec36fa35c0822300093b33060eeed21ab6cf0d 100644
--- a/ash/mus/bridge/wm_shell_mus.h
+++ b/ash/mus/bridge/wm_shell_mus.h
@@ -32,7 +32,6 @@ class ImmersiveHandlerFactoryMus;
 class WindowManager;
 class WmRootWindowControllerMus;
 class WmShellMusTestApi;
-class WmWindowMus;
 
 // WmShell implementation for mus.
 class WmShellMus : public WmShell,
@@ -48,10 +47,6 @@ class WmShellMus : public WmShell,
   void AddRootWindowController(WmRootWindowControllerMus* controller);
   void RemoveRootWindowController(WmRootWindowControllerMus* controller);
 
-  // Returns the ancestor of |window| (including |window|) that is considered
-  // toplevel. |window| may be null.
-  static WmWindowMus* GetToplevelAncestor(aura::Window* window);
-
   WmRootWindowControllerMus* GetRootWindowControllerWithDisplayId(int64_t id);
 
   AcceleratorControllerDelegateMus* accelerator_controller_delegate() {
@@ -123,9 +118,6 @@ class WmShellMus : public WmShell,
  private:
   friend class WmShellMusTestApi;
 
-  // Returns true if |window| is a window that can have active children.
-  static bool IsActivationParent(aura::Window* window);
-
   // aura::client::ActivationChangeObserver:
   void OnWindowActivated(ActivationReason reason,
                          aura::Window* gained_active,