Add patch to disable WebRTC

patches/disable-webrtc.patch

@@ -0,0 +1,24 @@
+commit aff93733a4c414f9182103b7384c23e6fa450a6a
+Author: csagan5 <32685696+csagan5@users.noreply.github.com>
+Date:   Thu Oct 26 16:59:03 2017 +0200
+
+    Disable WebRTC by default
+
+diff --git a/chrome/browser/ui/browser_ui_prefs.cc b/chrome/browser/ui/browser_ui_prefs.cc
+index 946f7cd..96b79b1 100644
+--- a/chrome/browser/ui/browser_ui_prefs.cc
++++ b/chrome/browser/ui/browser_ui_prefs.cc
+@@ -81,10 +81,10 @@ void RegisterBrowserUserPrefs(user_prefs::PrefRegistrySyncable* registry) {
+ #endif
+ #if BUILDFLAG(ENABLE_WEBRTC)
+   // TODO(guoweis): Remove next 2 options at M50.
+-  registry->RegisterBooleanPref(prefs::kWebRTCMultipleRoutesEnabled, true);
+-  registry->RegisterBooleanPref(prefs::kWebRTCNonProxiedUdpEnabled, true);
++  registry->RegisterBooleanPref(prefs::kWebRTCMultipleRoutesEnabled, false);
++  registry->RegisterBooleanPref(prefs::kWebRTCNonProxiedUdpEnabled, false);
+   registry->RegisterStringPref(prefs::kWebRTCIPHandlingPolicy,
+-                               content::kWebRTCIPHandlingDefault);
++                               content::kWebRTCIPHandlingDisableNonProxiedUdp);
+   registry->RegisterStringPref(prefs::kWebRTCUDPPortRange, std::string());
+ #endif
+