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

chrome/browser/android/webapk/webapk_installer_unittest.cc

Index: chrome/browser/android/webapk/webapk_installer_unittest.cc
diff --git a/chrome/browser/android/webapk/webapk_installer_unittest.cc b/chrome/browser/android/webapk/webapk_installer_unittest.cc
index 10021ff93107a0b7e7a694291742e2e107c0910b..bf986a877246af98db72d53298435d3811b09055 100644
--- a/chrome/browser/android/webapk/webapk_installer_unittest.cc
+++ b/chrome/browser/android/webapk/webapk_installer_unittest.cc
@@ -107,13 +107,16 @@ class WebApkInstallerRunner {
     const int kWebApkVersion = 1;
 
     WebApkInstaller* installer = CreateWebApkInstaller();
+    std::map<std::string, std::string> icon_url_hash_map;
+    icon_url_hash_map[best_icon_url_.spec()] = kIconMurmur2Hash;
 
     installer->UpdateAsyncWithURLRequestContextGetter(
         url_request_context_getter_.get(),
         base::Bind(&WebApkInstallerRunner::OnCompleted, base::Unretained(this)),
-        kIconMurmur2Hash,
         kDownloadedWebApkPackageName,
-        kWebApkVersion);
+        kWebApkVersion,
+        false /* stale_manifest */,
+        icon_url_hash_map);
 
     Run();
   }