Handle app custom icon via aura::Window property.

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

Index: chrome/browser/ui/ash/launcher/arc_app_window.h
diff --git a/chrome/browser/ui/ash/launcher/arc_app_window.h b/chrome/browser/ui/ash/launcher/arc_app_window.h
index ffef2ba06042266456663ed3bb8d31909d5d26b7..7b2b0d2661d65a8306017c4063a22d2d5a226ee3 100644
--- a/chrome/browser/ui/ash/launcher/arc_app_window.h
+++ b/chrome/browser/ui/ash/launcher/arc_app_window.h
@@ -13,7 +13,6 @@
 #include "chrome/browser/image_decoder.h"
 #include "chrome/browser/ui/ash/launcher/arc_app_shelf_id.h"
 #include "ui/base/base_window.h"
-#include "ui/gfx/image/image_skia.h"
 
 class ArcAppWindowLauncherController;
 class ArcAppWindowLauncherItemController;
@@ -63,8 +62,6 @@ class ArcAppWindow : public ui::BaseWindow, public ImageDecoder::ImageRequest {
 
   ArcAppWindowLauncherItemController* controller() { return controller_; }
 
-  const gfx::ImageSkia& icon() const { return icon_; }
-
   // ui::BaseWindow:
   bool IsActive() const override;
   bool IsMaximized() const override;
@@ -103,8 +100,6 @@ class ArcAppWindow : public ui::BaseWindow, public ImageDecoder::ImageRequest {
   ash::ShelfID shelf_id_;
   // Keeps current full-screen mode.
   FullScreenMode fullscreen_mode_ = FullScreenMode::NOT_DEFINED;
-  // Contains custom icon if it was set.
-  gfx::ImageSkia icon_;
   // Unowned pointers
   views::Widget* const widget_;
   ArcAppWindowLauncherController* const owner_;