Contributed by Eriq Augustine <eriq.augustine@gmail.com>

chrome/browser/extensions/extension_menu_manager.h

Index: chrome/browser/extensions/extension_menu_manager.h
===================================================================
--- chrome/browser/extensions/extension_menu_manager.h	(revision 116264)
+++ chrome/browser/extensions/extension_menu_manager.h	(working copy)
@@ -239,6 +239,12 @@
   // Returns the item with the given |id| or NULL.
   ExtensionMenuItem* GetItemById(const ExtensionMenuItem::Id& id) const;
 
+  // Notify the ExtensionMenuManager that an item has been updated not through
+  // an explicit call into ExtensionMenuManager. For example, if an item is
+  // acquired by a call to GetItemById and changed, then this should be called.
+  // Returns true if the item was found or false otherwise.
+  bool ItemUpdated(const ExtensionMenuItem::Id& id);
+
   // Called when a menu item is clicked on by the user.
   void ExecuteCommand(Profile* profile, content::WebContents* web_contents,
                       const ContextMenuParams& params,
@@ -261,6 +267,12 @@
   // items in the same group (i.e. that are adjacent in the list).
   void RadioItemSelected(ExtensionMenuItem* item);
 
+  // Make sure that there is only one radio item selected at once in any run.
+  // If there are no radio items selected, then the first item in the run
+  // will get selected. If there are multiple radio items selected, then only
+  // the last one will get selcted.
+  void SanitizeRadioList(const ExtensionMenuItem::List& item_list);

[asargent_no_longer_on_chrome, 2012/01/06 21:17:42]

Since you potentially modify some of |item_list|'s members by calling SetChecked
on them, you should pass a "ExtensionMenuItem::List*" instead of "const
ExtensionMenuItem::List&" to indicate to callers that this method modifies its
contents.

+
   // Returns true if item is a descendant of an item with id |ancestor_id|.
   bool DescendantOf(ExtensionMenuItem* item,
                     const ExtensionMenuItem::Id& ancestor_id);