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

third_party/widevine/cdm/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/config/chrome_build.gni")
 import("//build/config/features.gni")
-import("//chrome/version.gni")  # TODO layering violation
+import("//chrome/process_version_rc_template.gni")
 import("//media/cdm/ppapi/cdm_paths.gni")
 import("//media/cdm/ppapi/ppapi_cdm_adapter.gni")
 import("//third_party/widevine/cdm/widevine.gni")
 
 widevine_arch = current_cpu
 if (widevine_arch == "x86") {
   widevine_arch = "ia32"
 }
 
 widevine_cdm_binary_files = []
@@ skipping 104 matching lines @@
     ]
   }
 } else {
   group("widevine_cdm_manifest") {
     # NOP
   }
 }
 
 if ((is_chrome_branded || enable_widevine) && enable_pepper_cdms) {
   # Produce and compile the .rc file.
-  process_version("widevinecdmadapter_resources") {
+  process_version_rc_template("widevinecdmadapter_resources") {
     visibility = [ ":*" ]
-    template_file = chrome_version_rc_template
     sources = [
       "BRANDING",
       "widevinecdmadapter.ver",
     ]
     output = "$target_gen_dir/widevinecdmadapter_version.rc"
   }
 
   ppapi_cdm_adapter("widevinecdmadapter") {
     defines = []
     output_dir = "$root_out_dir/$widevine_cdm_path"
@@ skipping 31 matching lines @@
 # on the license server.
 source_set("widevine_test_license_server") {
   if (is_chrome_branded && is_linux) {
     deps = [
       # TODO(jrummell)
       # This target should be removed and targets should have data_deps on this target:
       #"//third_party/widevine/test/license_server/license_server.gyp:test_license_server"
     ]
   }
 }