Make FaviconService::GetRawFaviconForPageURL() select the best candidate among all the icon types

components/history/core/browser/thumbnail_database.h

Index: components/history/core/browser/thumbnail_database.h
diff --git a/components/history/core/browser/thumbnail_database.h b/components/history/core/browser/thumbnail_database.h
index b277d0e6cf4bbff032a26f77ef68207f8e72a1e0..ec21369d43830d0025471da7bfc3c42dd1803a0d 100644
--- a/components/history/core/browser/thumbnail_database.h
+++ b/components/history/core/browser/thumbnail_database.h
@@ -165,10 +165,6 @@ class ThumbnailDatabase {
   // not NULL.
 
   // Returns true if there are icon mappings for the given page and icon types.
-  // If |required_icon_types| contains multiple icon types and there is more
-  // than one matched icon type in the database, icons of only a single type
-  // will be returned in the priority of TOUCH_PRECOMPOSED_ICON, TOUCH_ICON,
-  // and FAVICON.
   // The matched icon mappings are returned in the |mapping_data| parameter if
   // it is not NULL.
   bool GetIconMappingsForPageURL(const GURL& page_url,