Add `privacy.network.webRTCNonProxiedUdpTransportEnabled` to extensions API

chrome/test/data/extensions/api_test/preference/standard/test.js

Index: chrome/test/data/extensions/api_test/preference/standard/test.js
diff --git a/chrome/test/data/extensions/api_test/preference/standard/test.js b/chrome/test/data/extensions/api_test/preference/standard/test.js
index 905bdbf3b3230af4097bd48ba72500432e1aebe0..8fdff4505a9e1bb2275280ed3131d410cfa6411e 100644
--- a/chrome/test/data/extensions/api_test/preference/standard/test.js
+++ b/chrome/test/data/extensions/api_test/preference/standard/test.js
@@ -10,7 +10,8 @@ var preferences_to_test = [
     root: chrome.privacy.network,
     preferences: [
       'networkPredictionEnabled',
-      'webRTCMultipleRoutesEnabled'
+      'webRTCMultipleRoutesEnabled',
+      'webRTCNonProxiedUdpEnabled'
     ]
   },
   {
@@ -41,8 +42,9 @@ var preferences_to_test = [
 // Some preferences are only present on certain platforms or are hidden
 // behind flags and might not be present when this test runs.
 var possibly_missing_preferences = new Set([
-  'protectedContentEnabled',    // Windows/ChromeOS only
-  'webRTCMultipleRoutesEnabled' // requires ENABLE_WEBRTC=1
+  'protectedContentEnabled',             // Windows/ChromeOS only
+  'webRTCMultipleRoutesEnabled',         // requires ENABLE_WEBRTC=1
+  'webRTCNonProxiedUdpEnabled'           // requires ENABLE_WEBRTC=1
 ]);
 
 function expect(expected, message) {