Use hi-resolution favicon variants if available.

chrome/browser/favicon/favicon_util.h

Index: chrome/browser/favicon/favicon_util.h
diff --git a/chrome/browser/favicon/favicon_util.h b/chrome/browser/favicon/favicon_util.h
index acaf90186c7b7348d52296b913b07c47cf0ecf01..b202d6063088cc74897036c71e9bc8dcc47c18fc 100644
--- a/chrome/browser/favicon/favicon_util.h
+++ b/chrome/browser/favicon/favicon_util.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_
 #define CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_
 
+#include <vector>
+
 class GURL;
 
 namespace content {
@@ -21,7 +23,7 @@ class FaviconUtil {
   // IPC message.
   static int DownloadFavicon(content::RenderViewHost* rvh,
                              const GURL& url,
-                             int image_size);
+                             std::vector<int> image_sizes);
 };
 
 #endif  // CHROME_BROWSER_FAVICON_FAVICON_UTIL_H_