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

media/cdm/ppapi/BUILD.gn

Index: media/cdm/ppapi/BUILD.gn
diff --git a/media/cdm/ppapi/BUILD.gn b/media/cdm/ppapi/BUILD.gn
index cc63fd899a4fb8f9f8515c4eee5e6082ca441c24..bb7c65f36ff57283047310abbfff2d68c2861f76 100644
--- a/media/cdm/ppapi/BUILD.gn
+++ b/media/cdm/ppapi/BUILD.gn
@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 
 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("//media/media_options.gni")
@@ -50,9 +50,8 @@ shared_library("clearkeycdm") {
   }
 }
 
-process_version("clearkeycdmadapter_resources") {
+process_version_rc_template("clearkeycdmadapter_resources") {
   visibility = [ ":*" ]
-  template_file = chrome_version_rc_template
   sources = [
     "//media/clearkeycdmadapter.ver",
     "external_clear_key/BRANDING",