Make proto enums canonical for ReadState/WriteState/ConnectState.

extensions/browser/api/cast_channel/BUILD.gn

Index: extensions/browser/api/cast_channel/BUILD.gn
diff --git a/extensions/browser/api/cast_channel/BUILD.gn b/extensions/browser/api/cast_channel/BUILD.gn
deleted file mode 100644
index 8a8dc36d3388c9b3aea7afe5056467b38274a16b..0000000000000000000000000000000000000000
--- a/extensions/browser/api/cast_channel/BUILD.gn
+++ /dev/null
@@ -1,13 +0,0 @@
-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import("//third_party/protobuf/proto_library.gni")
-
-# GYP version: extensions/extensions.gyp:cast_channel_proto
-proto_library("cast_channel_proto") {
-  sources = [
-    "cast_channel.proto",
-    "logging.proto",
-  ]
-}