Requiring key chord to delete icons and folders on the workspace

- Also fixing case where the all apps button to search for more apps
  was not focusable

Bug: 20639227
Change-Id: Ie4d9092e654d3cafc0eb346b3bb744ec3e295e92

src/com/android/launcher3/DeleteDropTarget.java

@@ -70,8 +70,10 @@ public class DeleteDropTarget extends ButtonDropTarget {
      * @return true if the item was removed.
      */
     public static boolean removeWorkspaceOrFolderItem(Launcher launcher, ItemInfo item, View view) {
-        // Remove the item from launcher and the db
-        launcher.removeItem(view, item, true /* deleteFromDb */);
+        // Remove the item from launcher and the db, we can ignore the containerInfo in this call
+        // because we already remove the drag view from the folder (if the drag originated from
+        // a folder) in Folder.beginDrag()
+        launcher.removeItem(view, null, item, true /* deleteFromDb */);
         launcher.getWorkspace().stripEmptyScreens();
         return true;
     }