Get rid of LASTCHANGE.blink

build/util/BUILD.gn

 # Copyright (c) 2013 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.
 
 action("webkit_version") {
   script = "version.py"
 
-  lastchange_file = "LASTCHANGE.blink"
+  lastchange_file = "LASTCHANGE"
 
   template_file = "webkit_version.h.in"
   inputs = [
     lastchange_file,
     template_file,
   ]
 
   output_file = "$target_gen_dir/webkit_version.h"
   outputs = [
     output_file,
   ]
 
   args = [
+    # LASTCHANGE contains "<build hash>-<ref>".  The user agent only wants the
+    # "<build hash>" bit, so chop off everything after it.
+    "-e",
+    "LASTCHANGE=LASTCHANGE[:LASTCHANGE.find('-')]",
     "-f",
     rebase_path(lastchange_file, root_build_dir),
     rebase_path(template_file, root_build_dir),
     rebase_path(output_file, root_build_dir),
   ]
 }
 
 action("chrome_version_json") {
   script = "version.py"
   _chrome_version_path = "//chrome/VERSION"
   inputs = [
     _chrome_version_path,
   ]
   _output_file = "$root_gen_dir/CHROME_VERSION.json"
   outputs = [
     _output_file,
   ]
   args = [
     "--file",
     rebase_path(_chrome_version_path, root_build_dir),
     "--template",
     "{\"full-quoted\": \"\\\"@MAJOR@.@MINOR@.@BUILD@.@PATCH@\\\"\"}",
     "--output",
     rebase_path(_output_file, root_build_dir),
   ]
 }