Create a new preference which disables UDP protocol for WebRTC

content/public/common/renderer_preferences.h

 // Copyright (c) 2012 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.
 //
 // A struct for managing browser's settings that apply to the renderer or its
 // webview.  These differ from WebPreferences since they apply to Chromium's
 // glue layer rather than applying to just WebKit.
 //
 // Adding new values to this class probably involves updating
 // common/view_messages.h, browser/browser.cc, etc.
@@ skipping 81 matching lines @@
 
   // Set to false to not send referrers.
   bool enable_referrers;
 
   // Set to true to indicate that the preference to set DNT to 1 is enabled.
   bool enable_do_not_track;
 
   // Set to false to indicate that WebRTC should use the OS default routing.
   bool enable_webrtc_multiple_routes;
 
+  // Set to true to indicate that WebRTC is allowed to use UDP to connect to
+  // peer
+  // or TURN servers. Default is true.

[pthatcher2, 2015/08/25 23:12:34]

Weird formatting

[guoweis_left_chromium, 2015/08/26 14:43:40]

Done.

+  bool enable_webrtc_udp_transport;
+
   // Default page zoom level.
   double default_zoom_level;
 
   // The user agent given to WebKit when it requests one and the user agent is
   // being overridden for the current navigation.
   std::string user_agent_override;
 
   // The accept-languages of the browser, comma-separated.
   std::string accept_languages;
 
@@ skipping 57 matching lines @@
   int32 arrow_bitmap_width_horizontal_scroll_bar_in_dips;
 #endif
 
   // The default font size used for rendering on Linux.
   int default_font_size;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_RENDERER_PREFERENCES_H_