gn: Generalize process_version() and move it to build/util (take #2)

remoting/host/win/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("//remoting/build/config/remoting_build.gni")
 import("//remoting/host/installer/win/generate_clsids.gni")
 import("//build/toolchain/win/midl.gni")
 import("//build/win/message_compiler.gni")
 
 group("all") {
@@ skipping 439 matching lines @@
 remoting_localize("remoting_windows_resources") {
   deps = [
     "//remoting/resources",
   ]
 
   sources = [
     "core.rc.jinja2",
     "version.rc.jinja2",
   ]
 
-  # TODO(zijiehe): Export lastchange_path from
-  # //chrome/version.gni:process_version
   variables = [
     rebase_path(chrome_version_file),
     rebase_path(remoting_version_file),
     rebase_path("//build/util/LASTCHANGE"),
   ]
 
   output = "$root_gen_dir/remoting/{{source_name_part}}"
 
   locale_dir = webapp_locale_dir
 
   encoding = "utf-16"
 
   locales = remoting_locales
 }
 # TODO(GYP) More Windows remoting targets from remoting_host_win.gypi