gn: Generalize process_version() and move it to build/util (take #2)

chrome/common/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/buildflag_header.gni")
+import("//build/util/process_version.gni")
 import("//chrome/common/features.gni")
-import("//chrome/version.gni")
+import("//chrome/process_version_rc_template.gni")  # For branding_file_path.
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/grit_rule.gni")
 
 grit("resources") {
   source = "common_resources.grd"
   use_qualified_include = true
   output_dir = "$root_gen_dir/chrome"
   output_name = "common_resources"
   outputs = [
     "grit/common_resources.h",
@@ skipping 485 matching lines @@
       ]
     }
   }
 }
 
 process_version("version_header") {
   # TODO(brettw) this should have more reduced visibility, but chrome/browser
   # currently depends on this.
   #visibility = [ ":*" ]
 
-  # This one just uses the custom template and no separate sources.
-  sources = []
+  sources = [
+    "//build/util/LASTCHANGE",
+    "//chrome/VERSION",
+    branding_file_path,
+  ]
   template_file = "chrome_version.h.in"
 
   output = "$target_gen_dir/chrome_version.h"
 }
 
 static_library("constants") {
   sources = [
     "chrome_constants.cc",
     "chrome_constants.h",
     "chrome_features.cc",
@@ skipping 119 matching lines @@
     "shell_handler_win.mojom",
   ]
 
   public_deps = [
     "//skia/public/interfaces",
     "//url/mojo:url_mojom_gurl",
   ]
 
   use_new_wrapper_types = false
 }