Fix the handling of user gestures for external protocol handler dialogs.

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 "chrome/browser/shell_integration.h"
@@ skipping 78 matching lines @@
   // url you have has been checked against the blacklist, and has been escaped.
   // All calls to this function should originate in some way from LaunchUrl.
   static void LaunchUrlWithoutSecurityCheck(const GURL& url,
                                             int render_process_host_id,
                                             int tab_contents_id);
 
   // Prepopulates the dictionary with known protocols to deny or allow, if
   // preferences for them do not already exist.
   static void PrepopulateDictionary(base::DictionaryValue* win_pref);
 
-  // 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();
+  class ScopedUserGesture {
+   public:
+     ScopedUserGesture();
+     ~ScopedUserGesture();
+   private:
+    DISALLOW_COPY_AND_ASSIGN(ScopedUserGesture);
+  };
+
+ private:
+   DISALLOW_COPY_AND_ASSIGN(ExternalProtocolHandler);
 };
 
+
 #endif  // CHROME_BROWSER_EXTERNAL_PROTOCOL_EXTERNAL_PROTOCOL_HANDLER_H_