Change WebRTC IP handling policy from multiple booleans to an enum.

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 155950b80f1bfa8f159000a7de16460150f86cfb..d3467af2a440308f2de6a3b94778ebbad819b94d 100644
--- a/content/public/common/renderer_preferences.h
+++ b/content/public/common/renderer_preferences.h
@@ -93,14 +93,9 @@ struct CONTENT_EXPORT RendererPreferences {
   // 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 false to indicate that WebRTC should not use non-proxied UDP to
-  // connect to peers and TURN servers, which effectively disables all WebRTC's
-  // UDP traffic for now, until UDP-based proxy support is available in
-  // Chromium. Default is true.
-  bool enable_webrtc_nonproxied_udp;
+  // This is the IP handling policy override for WebRTC. The value must be one
+  // of the strings defined in privacy.json.
+  std::string webrtc_ip_handling_policy;
 
   // Default page zoom level.
   double default_zoom_level;