Unbreak tabs.onRemove extension API in face of fast tab closure

chrome/browser/extensions/browser_event_router.h

Index: chrome/browser/extensions/browser_event_router.h
diff --git a/chrome/browser/extensions/browser_event_router.h b/chrome/browser/extensions/browser_event_router.h
index f424f57a66390043691581e8e697718eed15ebde..0f468e1f8923edda747fa75399f7a0293fd19e6f 100644
--- a/chrome/browser/extensions/browser_event_router.h
+++ b/chrome/browser/extensions/browser_event_router.h
@@ -130,6 +130,15 @@ class BrowserEventRouter : public TabStripModelObserver,
   void DispatchTabUpdatedEvent(content::WebContents* contents,
                                scoped_ptr<DictionaryValue> changed_properties);
 
+  void DispatchTabDetached(content::WebContents* contents, int index);
+
+  // Send Tab removed event and stop listening for notifications on said
+  // |contents|.
+  void DispatchTabRemovedAndUnregisterNotifications(
+        content::WebContents* contents,
+        int tab_id,
+        bool window_closing);
+
   // Called to dispatch a deprecated style page action click event that was
   // registered like:
   //   chrome.pageActions["name"].addListener(function(actionId, info){})