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

content/public/common/BUILD.gn

Index: content/public/common/BUILD.gn
diff --git a/content/public/common/BUILD.gn b/content/public/common/BUILD.gn
index c207e84d9920edb5592db3cff6a25e2eaf916962..169c054579ca1a8e5310f1572832470fbde9cc9e 100644
--- a/content/public/common/BUILD.gn
+++ b/content/public/common/BUILD.gn
@@ -81,6 +81,13 @@ source_set("common_sources") {
       "pepper_plugin_info.h",
     ]
   }
+
+  if (enable_webrtc) {
+    sources += [
+      "webrtc_ip_handling_policy.cc",
+      "webrtc_ip_handling_policy.h",
+    ]
+  }
 }
 
 mojom("mojo_bindings") {