Hook up external protocol handler to user gestures to prevent malicious sites...

chrome/browser/external_protocol_handler.h

Index: chrome/browser/external_protocol_handler.h
===================================================================
--- chrome/browser/external_protocol_handler.h	(revision 26890)
+++ chrome/browser/external_protocol_handler.h	(working copy)
@@ -64,6 +64,9 @@
   // Prepopulates the dictionary with known protocols to deny or allow, if
   // preferences for them do not already exist.
   static void PrepopulateDictionary(DictionaryValue* win_pref);
+
+  // Called when the user interacts with a web page.
+  static void OnUserGesture();
 };
 
 #endif  // CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_