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

remoting/host/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/util/process_version.gni")
 import("//remoting/build/config/remoting_build.gni")
 
 process_version("remoting_version") {
   template_file = "//remoting/host/version.h.in"
   sources = [
     branding_path,
   ]
   output = "$target_gen_dir/version.h"
 }
 
@@ skipping 942 matching lines @@
   remoting_localize("remoting_windows_resources") {
     deps = [
       "//remoting/resources",
     ]
 
     sources = [
       "win/core.rc.jinja2",
       "win/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
 
@@ skipping 922 matching lines @@
                       root_build_dir),
           rebase_path(outputs[0], root_build_dir),
         ]
       }
     } else {
       group("remoting_host_installation") {
       }
     }
   }
 }