[Android:WebAPK] Don't add webapp to homescreen if WebAPK install times out part 2/3

chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.webapps;
 
 import android.support.annotation.IntDef;
 
 import org.chromium.base.Callback;
 
@@ skipping 20 matching lines @@
     public static final int INSTALL_ERROR = 5;
     public static final int INSTALLED = 6;
 
     /**
      * Uses Google Play to install WebAPK asynchronously.
      * @param packageName The package name of WebAPK to install.
      * @param version The version of WebAPK to install.
      * @param title The title of the WebAPK to display during installation.
      * @param token The token from WebAPK Minter Server.
      * @param url The start URL of the WebAPK to install.
-     * @param callback The callback to invoke when the install is either completed or failed.
+     * @param callback The callback to invoke when the install completes, times out or fails.
      */
     void installAsync(String packageName, int version, String title, String token, String url,
-            Callback<Boolean> callback);
+            Callback<Integer> callback);
 
     /**
      * Calls the callback once the installation either succeeded or failed.
      * @param packageName The package name of WebAPK for the installation.
      * @param event The result of the install.
      */
     void onGotInstallEvent(String packageName, @InstallerPackageEvent int event);
-
-    /**
-     * Checks whether Google Play Install API is available.
-     * @param callback The callback to invoke when the check is done.
-     */
-    void canInstallWebApk(Callback<Boolean> callback);
 }