Delete ToastController.

Somehow in cherry-picking and merging back down to master, it got
added back.

Change-Id: I71fbb7f02c258a497119ea16271c26a466d68dea

src/com/android/settings/overlay/ToastController.java

@@ -1,10 +0,0 @@
-package com.android.settings.overlay;
-
-import android.content.Context;
-
-/**
- * Will be removed before submitting. Just a proof of concept for review.
- */
-public interface ToastController {
-    void makeToast(Context context);
-}