Add support for favicon scale factor in WebUI

chrome/browser/resources/options/browser_options_startup_page_list.js

Index: chrome/browser/resources/options/browser_options_startup_page_list.js
diff --git a/chrome/browser/resources/options/browser_options_startup_page_list.js b/chrome/browser/resources/options/browser_options_startup_page_list.js
index 7964c43cfbabc3aa3e5505d9dc85e0de299136a7..c85ba018d3870e9474abc1affc32ac5a782cfa6b 100644
--- a/chrome/browser/resources/options/browser_options_startup_page_list.js
+++ b/chrome/browser/resources/options/browser_options_startup_page_list.js
@@ -57,7 +57,7 @@ cr.define('options.browser_options', function() {
       titleEl.classList.add('weakrtl');
       titleEl.textContent = pageInfo.title;
       if (!this.isPlaceholder) {
-        titleEl.style.backgroundImage = url('chrome://favicon/' + pageInfo.url);
+        titleEl.style.backgroundImage = url(getFaviconURL(pageInfo.url));
         titleEl.title = pageInfo.tooltip;
       }