Create a new preference which disables UDP protocol for WebRTC

content/public/common/renderer_preferences.h

Index: content/public/common/renderer_preferences.h
diff --git a/content/public/common/renderer_preferences.h b/content/public/common/renderer_preferences.h
index 0868d89283c0b1260780206a8990fe027592c562..1a9af0360450c66d3ba3a77e4163301968b74874 100644
--- a/content/public/common/renderer_preferences.h
+++ b/content/public/common/renderer_preferences.h
@@ -99,6 +99,10 @@ struct CONTENT_EXPORT RendererPreferences {
   // 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 non-proxied UDP to

[Charlie Reis, 2015/08/28 17:19:21]

nit: This should probably be rephrased starting with "Set to false to...," since
it defaults to true.

(I find it confusing that we have enable_* preferences that default to both true
and false, as well as disable_* preferences.  The "convention" so far, if there
is one, seems to be this "Set to true/false" comment to indicate how to override
the default if desired.  That said, I do appreciate you saying what the default
is in the comment.)

+  // connect to peers and TURN servers. Default is true.
+  bool enable_webrtc_nonproxied_udp_transport;
+
   // Default page zoom level.
   double default_zoom_level;