Removing support for adding legacy shortcuts.

All existing legacy shortcuts will be migrated one-time to deep shortcuts
This shortcuts are pinned under the Launcher package, with custom badging

Bug: 275875209
Test: Updated unit tests
Flag: N/A
Change-Id: I7da001f724776ad8d6c807517b7e4e259de626c2

src/com/android/launcher3/model/data/WorkspaceItemInfo.java

@@ -78,12 +78,6 @@ public class WorkspaceItemInfo extends ItemInfoWithIcon {
     @NonNull
     public Intent intent;
 
-    /**
-     * If isShortcut=true and customIcon=false, this contains a reference to the
-     * shortcut icon as an application's resource.
-     */
-    public Intent.ShortcutIconResource iconResource;
-
     /**
      * A message to display when the user tries to start a disabled shortcut.
      * This is currently only used for deep shortcuts.
@@ -109,7 +103,6 @@ public class WorkspaceItemInfo extends ItemInfoWithIcon {
         super(info);
         title = info.title;
         intent = new Intent(info.intent);
-        iconResource = info.iconResource;
         status = info.status;
         personKeys = info.personKeys.clone();
     }
@@ -141,10 +134,6 @@ public class WorkspaceItemInfo extends ItemInfoWithIcon {
         if (!usingLowResIcon()) {
             writer.putIcon(bitmap, user);
         }
-        if (iconResource != null) {
-            writer.put(Favorites.ICON_PACKAGE, iconResource.packageName)
-                    .put(Favorites.ICON_RESOURCE, iconResource.resourceName);
-        }
     }
 
     @Override