Add gfx::ImageSkia and icon support to aura::PropertyConverter.

ash/mus/property_util.cc

Index: ash/mus/property_util.cc
diff --git a/ash/mus/property_util.cc b/ash/mus/property_util.cc
index 9aa2a9f302be21f12d58b2b0fedade91f8f00b4e..9b646dec64e67c647e9918475a280046ab3981fa 100644
--- a/ash/mus/property_util.cc
+++ b/ash/mus/property_util.cc
@@ -191,16 +191,6 @@ base::string16 GetWindowTitle(const ui::Window* window) {
       ui::mojom::WindowManager::kWindowTitle_Property);
 }
 
-mojo::Array<uint8_t> GetWindowAppIcon(const ui::Window* window) {
-  if (window->HasSharedProperty(
-          ui::mojom::WindowManager::kWindowAppIcon_Property)) {
-    return mojo::Array<uint8_t>::From(
-        window->GetSharedProperty<std::vector<uint8_t>>(
-            ui::mojom::WindowManager::kWindowAppIcon_Property));
-  }
-  return mojo::Array<uint8_t>();
-}
-
 void SetAppID(ui::Window* window, const base::string16& app_id) {
   window->SetSharedProperty<base::string16>(
       ui::mojom::WindowManager::kAppID_Property, app_id);