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

build/util/version.gni

 # 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.
 
 # This exposes the Chrome version as GN variables for use in build files.
 #
 # PREFER NOT TO USE THESE. The GYP build uses this kind of thing extensively.
 # However, it is far better to write an action (or use the process_version
-# wrapper in chrome/version.gni) to generate a file at build-time with the
+# wrapper in build/util/version.gni) to generate a file at build-time with the
 # information you need. This allows better dependency checking and GN will
 # run faster.
 #
 # These values should only be used if you REALLY need to depend on them at
 # build-time, for example, in the computation of output file names.
 
 # Give version.py a pattern that will expand to a GN scope consisting of
 # all values we need at once.
 _version_dictionary_template = "full = \"@MAJOR@.@MINOR@.@BUILD@.@PATCH@\" " +
                                "major = \"@MAJOR@\" minor = \"@MINOR@\" " +
@@ skipping 30 matching lines @@
                           "@BUILD@.@PATCH_HI@.@PATCH_LO@",
                           "-e",
                           "PATCH_HI=int(PATCH)/256",
                           "-e",
                           "PATCH_LO=int(PATCH)%256",
                         ],
                         "trim string",
                         [ chrome_version_file ])
   chrome_dylib_version = _result
 }