Remove Windows Vista/XP specific code from net/base

net/BUILD.gn

 # Copyright (c) 2013 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/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
@@ skipping 1639 matching lines @@
 
   # Symbols for crashes when running tests on swarming.
   if (symbol_level > 0) {
     if (is_win) {
       data += [ "$root_out_dir/net_unittests.exe.pdb" ]
     } else if (is_mac) {
       # TODO(crbug.com/330301): make this conditional on mac_strip_release.
       # data += [ "$root_out_dir/net_unittests.dSYM/" ]
     }
   }
+
+  if (is_win) {
+    libs = [
+      "iphlpapi.lib",
+    ]
+  }
 }
 
 # !is_android && !is_win && !is_mac
 if (!is_ios) {
   # TODO(crbug.com/594965): this should be converted to "app" template and
   # enabled on iOS too.
   executable("net_perftests") {
     testonly = true
     sources = [
       "base/mime_sniffer_perftest.cc",
@@ skipping 343 matching lines @@
     "url_request/url_request_fuzzer.cc",
   ]
   deps = [
     ":net_fuzzer_test_support",
     ":test_support",
     "//base",
     "//net",
   ]
   dict = "data/http/http.dict"
 }