Revert of [cast_channel] Move cast_channel related files from //extensions to //components

extensions/browser/api/BUILD.gn

 # Copyright 2016 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("//extensions/common/api/schema.gni")
 import("//tools/json_schema_compiler/json_schema_api.gni")
 
 source_set("api") {
   sources = [
     "api_resource.cc",
@@ skipping 124 matching lines @@
   impl_dir = "//extensions/browser/api"
   bundle_registration = true
   bundle_name = ""
   root_namespace = extensions_api_root_namespace
   uncompiled_sources = extensions_api_uncompiled_sources
 
   deps = [
     ":api",
     "//device/serial",
     "//extensions/common/api",
+    "//extensions/common/api/cast_channel:cast_channel_proto",
     "//skia",
   ]
 }