Propagate network delegate events to ChromeDataUseAscriber.

components/data_use_measurement/core/BUILD.gn

 # Copyright 2015 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.
 
 static_library("core") {
   sources = [
+    "data_use_ascriber.cc",
     "data_use_ascriber.h",
+    "data_use_network_delegate.cc",
+    "data_use_network_delegate.h",
     "data_use_user_data.cc",
     "data_use_user_data.h",
   ]
   deps = [
     "//base",
     "//net",
   ]
 }