Tabs API is usable without tabs permission.

chrome/browser/extensions/event_listener_map.h

Index: chrome/browser/extensions/event_listener_map.h
diff --git a/chrome/browser/extensions/event_listener_map.h b/chrome/browser/extensions/event_listener_map.h
index 6c5c304f6826cbd48a443e57ddcd505c41754056..f935fe1a65db0e462cdb1fbb23e1488652d2b5f3 100644
--- a/chrome/browser/extensions/event_listener_map.h
+++ b/chrome/browser/extensions/event_listener_map.h
@@ -93,8 +93,11 @@ class EventListenerMap {
   bool RemoveListener(const EventListener* listener);
 
   // Returns the set of listeners that want to be notified of |event|.
-  std::set<const EventListener*> GetEventListeners(
-      const Event& event);
+  std::set<const EventListener*> GetEventListeners(const Event& event);
+
+  ListenerList& listeners(const std::string& event_name) {

[Aaron Boodman, 2012/08/30 05:45:48]

Can you return const&?

Also I noticed the call site was making a copy, even though you return by ref
here. Would be better to be an actual reference.

[chebert, 2012/08/30 23:17:20]

Done.

+    return listeners_[event_name];
+  }
 
   // Removes all listeners with process equal to |process|.
   void RemoveListenersForProcess(const content::RenderProcessHost* process);