Add support to process favicons from Web Manifests

chrome/browser/extensions/favicon_downloader.cc

Index: chrome/browser/extensions/favicon_downloader.cc
diff --git a/chrome/browser/extensions/favicon_downloader.cc b/chrome/browser/extensions/favicon_downloader.cc
index fa6f2ad0e63cbbabaefa22e602302aefaed2c7dc..e0cdee4a48d2666f1f0bb7edb8bd52d9ee0131b4 100644
--- a/chrome/browser/extensions/favicon_downloader.cc
+++ b/chrome/browser/extensions/favicon_downloader.cc
@@ -63,8 +63,10 @@ std::vector<content::FaviconURL>
           : nullptr;
   // If favicon_urls() is empty, we are guaranteed that DidUpdateFaviconURLs has
   // not yet been called for the current page's navigation.
-  return content_favicon_driver ? content_favicon_driver->favicon_urls()
-                                : std::vector<content::FaviconURL>();
+  return content_favicon_driver
+             ? content_favicon_driver->favicon_urls().value_or(
+                   std::vector<content::FaviconURL>())
+             : std::vector<content::FaviconURL>();
 }
 
 void FaviconDownloader::FetchIcons(