Move net-export resources to //components/net_log

components/net_log/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.
 
 source_set("net_log") {
   sources = [
     "chrome_net_log.cc",
     "chrome_net_log.h",
+    "net_export_ui_constants.cc",
+    "net_export_ui_constants.h",
     "net_log_temp_file.cc",
     "net_log_temp_file.h",
   ]
 
   deps = [
     "//base",
     "//components/data_reduction_proxy/core/common",
     "//components/version_info",
     "//net",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "net_log_temp_file_unittest.cc",
   ]
   deps = [
     "//base",
     "//net",
     "//testing/gtest",
     ":net_log",
   ]
 }