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

chrome/browser/ui/browser_ui_prefs.cc

Index: chrome/browser/ui/browser_ui_prefs.cc
diff --git a/chrome/browser/ui/browser_ui_prefs.cc b/chrome/browser/ui/browser_ui_prefs.cc
index 1b25184cc7243293041b90bb108422d1a8d4a53f..6fef9f7457c4cf90ce08fa76245f8fc977818a90 100644
--- a/chrome/browser/ui/browser_ui_prefs.cc
+++ b/chrome/browser/ui/browser_ui_prefs.cc
@@ -12,6 +12,7 @@
 #include "chrome/common/pref_names.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/translate/core/common/translate_pref_names.h"
+#include "content/public/common/webrtc_ip_handling_policy.h"
 
 namespace chrome {
 
@@ -102,8 +103,11 @@ void RegisterBrowserUserPrefs(user_prefs::PrefRegistrySyncable* registry) {
       false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 #if defined(ENABLE_WEBRTC)
+  // TODO(guoweis): Remove next 2 options at M50.
   registry->RegisterBooleanPref(prefs::kWebRTCMultipleRoutesEnabled, true);
   registry->RegisterBooleanPref(prefs::kWebRTCNonProxiedUdpEnabled, true);
+  registry->RegisterStringPref(prefs::kWebRTCIPHandlingPolicy,
+                               content::kWebRTCIPHandlingDefault);
 #endif
 
   // Dictionaries to keep track of default tasks in the file browser.