Promotes common functions to WmRootWindowController

ash/aura/wm_root_window_controller_aura.h

Index: ash/aura/wm_root_window_controller_aura.h
diff --git a/ash/aura/wm_root_window_controller_aura.h b/ash/aura/wm_root_window_controller_aura.h
index 0b8883973db106091f94ebe4bda4407d7927b03d..ec78df2c0d1d5ce5c9a1be023c35f53dea29564d 100644
--- a/ash/aura/wm_root_window_controller_aura.h
+++ b/ash/aura/wm_root_window_controller_aura.h
@@ -34,12 +34,6 @@ class ASH_EXPORT WmRootWindowControllerAura : public WmRootWindowController {
   WmShell* GetShell() override;
   WmShelf* GetShelf() override;
   WmWindow* GetWindow() override;
-  void ConfigureWidgetInitParamsForContainer(
-      views::Widget* widget,
-      int shell_container_id,
-      views::Widget::InitParams* init_params) override;
-  WmWindow* FindEventTarget(const gfx::Point& location_in_screen) override;
-  gfx::Point GetLastMouseLocationInRoot() override;
   void OnInitialWallpaperAnimationStarted() override;
   void OnWallpaperAnimationFinished(views::Widget* widget) override;