Handle app custom icon via aura::Window property.

chrome/browser/ui/ash/launcher/arc_app_window_launcher_item_controller.h

Index: chrome/browser/ui/ash/launcher/arc_app_window_launcher_item_controller.h
diff --git a/chrome/browser/ui/ash/launcher/arc_app_window_launcher_item_controller.h b/chrome/browser/ui/ash/launcher/arc_app_window_launcher_item_controller.h
index ec8af9cf38c1c1f131a901588936529bee45e4cc..5220e855775292efce7af5be719e57781e2e964b 100644
--- a/chrome/browser/ui/ash/launcher/arc_app_window_launcher_item_controller.h
+++ b/chrome/browser/ui/ash/launcher/arc_app_window_launcher_item_controller.h
@@ -12,7 +12,6 @@
 #include "chrome/browser/ui/ash/launcher/app_window_launcher_item_controller.h"
 
 class ArcAppWindow;
-class ChromeLauncherController;
 
 // Shelf item delegate for ARC app windows.
 class ArcAppWindowLauncherItemController
@@ -35,18 +34,12 @@ class ArcAppWindowLauncherItemController
   void RemoveTaskId(int task_id);
   bool HasAnyTasks() const;
 
-  // AppWindowLauncherItemController:
-  void UpdateLauncherItem() override;
-
  private:
   // Update the shelf item's icon for the active window.
   void UpdateIcon(ArcAppWindow* arc_app_window);
 
   std::unordered_set<int> task_ids_;
 
-  // Unowned property.
-  ChromeLauncherController* const owner_;
-
   DISALLOW_COPY_AND_ASSIGN(ArcAppWindowLauncherItemController);
 };