Removed NOTIFICATION_BROWSER_CLOSING notification

chrome/browser/ui/browser_list_observer.h

Index: chrome/browser/ui/browser_list_observer.h
diff --git a/chrome/browser/ui/browser_list_observer.h b/chrome/browser/ui/browser_list_observer.h
index 42af6d3086e65261be084bbf6d229111a5fb82cf..a734298b6140beb00c001e1884d3a1e0dce9307d 100644
--- a/chrome/browser/ui/browser_list_observer.h
+++ b/chrome/browser/ui/browser_list_observer.h
@@ -14,6 +14,13 @@ class BrowserListObserver {
   // Called immediately after a browser is added to the list
   virtual void OnBrowserAdded(Browser* browser) {}
 
+  // When a browser closes OnBrowserCloseStarted() is called. This is
+  // followed by one of OnBrowserCloseCancelled() or OnBrowserRemoved().
+  virtual void OnBrowserCloseStarted(Browser* browser) {}
+
+  // Called when a browser closing is cancelled.
+  virtual void OnBrowserCloseCancelled(Browser* browser) {}
+
   // Called immediately after a browser is removed from the list
   virtual void OnBrowserRemoved(Browser* browser) {}