[mus+ash] Removes WmWindow from ash (app_list, frame, metrics, session, system, wallpaper)

ash/wm_window.h

Index: ash/wm_window.h
diff --git a/ash/wm_window.h b/ash/wm_window.h
index 6aefd96a6e422bb61630deddefcee83e4f875a29..9290ee14fc68faa70872d7af18f9cfe6e0c7608c 100644
--- a/ash/wm_window.h
+++ b/ash/wm_window.h
@@ -36,7 +36,6 @@ class Layer;
 
 namespace ash {
 
-class ImmersiveFullscreenController;
 class RootWindowController;
 class WmTransientWindowObserver;
 enum class WmWindowProperty;
@@ -260,11 +259,6 @@ class ASH_EXPORT WmWindow : public ::wm::TransientWindowObserver {
 
   std::vector<WmWindow*> GetChildren();
 
-  // Installs a resize handler on the window that makes it easier to resize
-  // the window. See ResizeHandleWindowTargeter for the specifics.
-  void InstallResizeHandleWindowTargeter(
-      ImmersiveFullscreenController* immersive_fullscreen_controller);
-
   // See description in SetBoundsInScreen().
   void SetBoundsInScreenBehaviorForChildren(BoundsInScreenBehavior behavior);