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

chrome/android/javatests/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 android.content.Context;
 import android.test.suitebuilder.annotation.MediumTest;
 
 import org.chromium.base.ThreadUtils;
@@ skipping 58 matching lines @@
             mWaiter.notifyCalled();
         }
 
         @Override
         public void onGotManifestData(WebApkInfo fetchedInfo, String bestIconUrl) {
             super.onGotManifestData(fetchedInfo, bestIconUrl);
             mWaiter.notifyCalled();
         }
 
         @Override
-        protected void updateAsync(WebApkInfo fetchedInfo, String bestIconUrl) {
+        protected void updateAsync(WebApkInfo fetchedInfo, String bestIconUrl,
+                boolean staleManifest) {
             mNeedsUpdate = true;
         }
 
         public boolean needsUpdate() {
             return mNeedsUpdate;
         }
     }
 
     private static class CreationData {
         public String manifestUrl;
@@ skipping 100 matching lines @@
         // URL canonicalization should replace "%62" with 'b'.
         CreationData creationData = defaultCreationData(mTestServer);
         creationData.startUrl = mTestServer.getURL(
                 "/chrome/test/data/banners/manifest_%62est_page.html");
 
         WebappTestPage.navigateToPageWithServiceWorkerAndManifest(
                 mTestServer, mTab, WEBAPK_MANIFEST_URL);
         assertTrue(checkUpdateNeeded(creationData));
     }
 }