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

components/cronet/ios/BUILD.gn

 # Copyright 2015 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/process_version.gni")
 import("//build/util/version.gni")
-import("//chrome/version.gni")
 import("//testing/test.gni")
 import("//url/features.gni")
 
 assert(!is_component_build, "Cronet requires static library build.")
 
 declare_args() {
   cronet_enable_data_reduction_proxy_support = false
 }
 
 process_version("cronet_version_header") {
   template_file = "//components/cronet/version.h.in"
+  sources = [
+    "//chrome/VERSION",
+  ]
   output = "$target_gen_dir/version.h"
   extra_args = [
     "-e",
     "VERSION_FULL=\"%s.%s.%s.%s\" % (MAJOR,MINOR,BUILD,PATCH)",
   ]
 }
 
 source_set("cronet_sources") {
   deps = [
     ":cronet_version_header",
@@ skipping 148 matching lines @@
     ]
   }
 
   group("cronet_package") {
     deps = [
       ":cronet_package_copy",
       ":generate_license",
     ]
   }
 }