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

chrome/browser/extensions/api/preference/preference_api.cc

Index: chrome/browser/extensions/api/preference/preference_api.cc
diff --git a/chrome/browser/extensions/api/preference/preference_api.cc b/chrome/browser/extensions/api/preference/preference_api.cc
index fa7e8695e4bf8b44658f0d6a2f8fed6a5d86c365..7dae55e94f0e649009e4d4e80252ad674bf4a361 100644
--- a/chrome/browser/extensions/api/preference/preference_api.cc
+++ b/chrome/browser/extensions/api/preference/preference_api.cc
@@ -119,10 +119,15 @@ PrefMappingEntry kPrefMapping[] = {
     {"translationServiceEnabled", prefs::kEnableTranslate,
      APIPermission::kPrivacy, APIPermission::kPrivacy},
 #if defined(ENABLE_WEBRTC)
+    // webRTCMultipleRoutesEnabled and webRTCNonProxiedUdpEnabled have been
+    // replaced by webRTCIPHandlingPolicy. Leaving it for backward
+    // compatibility. TODO(guoweis): Remove this in M50.
     {"webRTCMultipleRoutesEnabled", prefs::kWebRTCMultipleRoutesEnabled,
      APIPermission::kPrivacy, APIPermission::kPrivacy},
     {"webRTCNonProxiedUdpEnabled", prefs::kWebRTCNonProxiedUdpEnabled,
      APIPermission::kPrivacy, APIPermission::kPrivacy},
+    {"webRTCIPHandlingPolicy", prefs::kWebRTCIPHandlingPolicy,
+     APIPermission::kPrivacy, APIPermission::kPrivacy},
 #endif
     // accessibilityFeatures.animationPolicy is available for
     // all platforms but the others from accessibilityFeatures