Add missing header files to GN files (2 of N)

media/cast/BUILD.gn

 # 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("//build/config/android/config.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 24 matching lines @@
     "logging/encoding_event_subscriber.h",
     "logging/log_deserializer.cc",
     "logging/log_deserializer.h",
     "logging/log_event_dispatcher.cc",
     "logging/log_event_dispatcher.h",
     "logging/log_serializer.cc",
     "logging/log_serializer.h",
     "logging/logging_defines.cc",
     "logging/logging_defines.h",
     "logging/proto/proto_utils.cc",
+    "logging/proto/proto_utils.h",
     "logging/raw_event_subscriber.h",
     "logging/raw_event_subscriber_bundle.cc",
     "logging/raw_event_subscriber_bundle.h",
     "logging/receiver_time_offset_estimator.h",
     "logging/receiver_time_offset_estimator_impl.cc",
     "logging/receiver_time_offset_estimator_impl.h",
     "logging/simple_event_subscriber.cc",
     "logging/simple_event_subscriber.h",
     "logging/stats_event_subscriber.cc",
     "logging/stats_event_subscriber.h",
@@ skipping 487 matching lines @@
     ":sender",
   ]
 }
 
 static_library("cast_receiver") {
   complete_static_lib = true
   deps = [
     ":receiver",
   ]
 }