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

chrome/browser/android/webapk/webapk_installer.h

Index: chrome/browser/android/webapk/webapk_installer.h
diff --git a/chrome/browser/android/webapk/webapk_installer.h b/chrome/browser/android/webapk/webapk_installer.h
index c24a66886f1d919d5d86d9a41f6c0baaeb25b304..6258b8d5536e5350cb738f145b46b5bf419d79ac 100644
--- a/chrome/browser/android/webapk/webapk_installer.h
+++ b/chrome/browser/android/webapk/webapk_installer.h
@@ -67,7 +67,9 @@ class WebApkInstaller : public net::URLFetcherDelegate {
                    const FinishCallback& callback,
                    const std::string& icon_murmur2_hash,
                    const std::string& webapk_package,
-                   int webapk_version);
+                   int webapk_version,
+                   bool stale_manifest,
+                   const std::vector<std::string>& icon_hashs);
 
   // Same as UpdateAsync() but uses the passed in |request_context_getter|.
   void UpdateAsyncWithURLRequestContextGetter(
@@ -75,7 +77,9 @@ class WebApkInstaller : public net::URLFetcherDelegate {
       const FinishCallback& callback,
       const std::string& icon_murmur2_hash,
       const std::string& webapk_package,
-      int webapk_version);
+      int webapk_version,
+      bool stale_manifest,
+      const std::vector<std::string>& icon_hashs);
 
   // Sets the timeout for the server requests.
   void SetTimeoutMs(int timeout_ms);