Rename ExternalProtocolHandler::OnUserGesture -> PermitLaunchUrl & call from EFD::HandleRequest

chrome/browser/external_protocol_handler.h

Index: chrome/browser/external_protocol_handler.h
diff --git a/chrome/browser/external_protocol_handler.h b/chrome/browser/external_protocol_handler.h
index d9b959270d708715d4a1a94d2367de931dbc4872..d67a27376657610d730420ce17b2454dcdf052a9 100644
--- a/chrome/browser/external_protocol_handler.h
+++ b/chrome/browser/external_protocol_handler.h
@@ -69,8 +69,11 @@ class ExternalProtocolHandler {
   // 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();
+  // Allows LaunchUrl to proceed with launching an external protocol handler.
+  // This is typically triggered by a user gesture, but is also called for
+  // each extension API function. Note that each call to LaunchUrl resets
+  // the state to false (not allowed).
+  static void PermitLaunchUrl();
 };
 
 #endif  // CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_