Fix gn build.

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.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 347 matching lines @@
     "src/allocation-tracker.cc",
     "src/allocation-tracker.h",
     "src/api.cc",
     "src/api.h",
     "src/arguments.cc",
     "src/arguments.h",
     "src/assembler.cc",
     "src/assembler.h",
     "src/assert-scope.h",
     "src/assert-scope.cc",
+    "src/ast-value-factory.cc",
+    "src/ast-value-factory.h",
     "src/ast.cc",
     "src/ast.h",
     "src/bignum-dtoa.cc",
     "src/bignum-dtoa.h",
     "src/bignum.cc",
     "src/bignum.h",
     "src/bootstrapper.cc",
     "src/bootstrapper.h",
     "src/builtins.cc",
     "src/builtins.h",
@@ skipping 677 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }