Clears out external protocol data when cookies and site data is cleared.

chrome/browser/external_protocol/external_protocol_handler.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTERNAL_PROTOCOL_EXTERNAL_PROTOCOL_HANDLER_H_
 #define CHROME_BROWSER_EXTERNAL_PROTOCOL_EXTERNAL_PROTOCOL_HANDLER_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 122 matching lines @@
   //       to protect against this scenario.
   // This is implemented separately on each platform.
   // TODO(davidsac): Consider refactoring this to take a WebContents directly.
   // crbug.com/668289
   static void RunExternalProtocolDialog(const GURL& url,
                                         int render_process_host_id,
                                         int routing_id,
                                         ui::PageTransition page_transition,
                                         bool has_user_gesture);
 
+  // Clears the external protocol handling data.
+  static void ClearData(Profile* profile);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ExternalProtocolHandler);
 };
 
 #endif  // CHROME_BROWSER_EXTERNAL_PROTOCOL_EXTERNAL_PROTOCOL_HANDLER_H_