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

ios/crnet/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("//build/buildflag_header.gni")
 import("//build/config/ios/rules.gni")
 import("//build/config/mac/symbols.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//build/util/version.gni")
-import("//chrome/version.gni")
 import("//testing/test.gni")
 import("//url/features.gni")
 
 assert(!is_component_build, "CrNet requires static library build.")
 
 source_set("crnet_sources") {
   deps = [
     "//base:base",
     "//components/metrics:metrics",
     "//components/metrics/proto:proto",
@@ skipping 105 matching lines @@
 
   public_headers = [ "CrNet.h" ]
 
   sources = [
     "CrNet.h",
   ]
 
   configs -= [ "//build/config/compiler:default_symbols" ]
   configs += [ "//build/config/compiler:symbols" ]
 }