Move clear instant app dialog logic out of AppInfoDashboardFragment.

- refactor AppInfoDashboardFragment and move the clear instant app dialog
handling into instant app button controller.
- move the dialog fragment to be a stand-alone class instead of inner
class.

Change-Id: I51c045938f3fd1db73b4b9f7e0311a51df599a29
Fixes: 110102457
Test: make RunSettingsRoboTests

src/com/android/settings/applications/appinfo/ButtonActionDialogFragment.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy
+ * of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
 package com.android.settings.applications.appinfo;
 
 import android.app.AlertDialog;