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..6c0330d2a0d8b13eaf884943b154482ee8f4f459 100644
--- a/chrome/browser/extensions/api/preference/preference_api.cc
+++ b/chrome/browser/extensions/api/preference/preference_api.cc
@@ -119,9 +119,11 @@ PrefMappingEntry kPrefMapping[] = {
     {"translationServiceEnabled", prefs::kEnableTranslate,
      APIPermission::kPrivacy, APIPermission::kPrivacy},
 #if defined(ENABLE_WEBRTC)
+    // webRTCMultipleRoutesEnabled has become obsoleted and replaced by
+    // webRTCIPHandlingPolicy. Leaving it to allow reading from it.

[Devlin, 2015/10/27 16:13:31]

Add a TODO to clean this up after a couple milestones (maybe M50?).

[guoweis_left_chromium, 2015/10/27 20:32:00]

Done.

     {"webRTCMultipleRoutesEnabled", prefs::kWebRTCMultipleRoutesEnabled,
-     APIPermission::kPrivacy, APIPermission::kPrivacy},
-    {"webRTCNonProxiedUdpEnabled", prefs::kWebRTCNonProxiedUdpEnabled,

[Devlin, 2015/10/27 16:13:31]

Does this one not need to be left for now?

+     APIPermission::kPrivacy, APIPermission::kInvalid},

[Devlin, 2015/10/27 16:13:31]

We should make this writable, still.  Otherwise extensions that used to work
won't the second this is released.  We should give extensions a few milestones
to update.

[guoweis_left_chromium, 2015/10/27 20:32:00]

Done.

+    {"webRTCIPHandlingPolicy", prefs::kWebRTCIPHandlingPolicy,
      APIPermission::kPrivacy, APIPermission::kPrivacy},
 #endif
     // accessibilityFeatures.animationPolicy is available for