Add a flag in WebAPK's proto when the Web App Manifest is no longer available.

chrome/android/junit/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.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 static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
@@ skipping 120 matching lines @@
             return mDestroyedFetcher;
         }
 
         @Override
         protected WebApkUpdateDataFetcher buildFetcher() {
             mFetcher = new TestWebApkUpdateDataFetcher();
             return mFetcher;
         }
 
         @Override
-        protected void updateAsync(WebApkInfo info, String bestIconUrl) {
+        protected void updateAsync(WebApkInfo info, String bestIconUrl, boolean isManifestStale) {
             mUpdateRequested = true;
             mUpdateName = info.name();
         }
 
         @Override
         protected void destroyFetcher() {
             mFetcher = null;
             mDestroyedFetcher = true;
         }
 
@@ skipping 554 matching lines @@
 
         ManifestData fetchedData = defaultManifestData();
         fetchedData.bestIconUrl = iconUrl2;
         fetchedData.iconUrlToMurmur2HashMap.clear();
         fetchedData.iconUrlToMurmur2HashMap.put(iconUrl1, null);
         fetchedData.iconUrlToMurmur2HashMap.put(iconUrl2, hash2);
 
         assertFalse(checkUpdateNeededForFetchedManifest(oldData, fetchedData));
     }
 }