Remove the checked-in scons configuration files.

build/external_code.scons

Index: build/external_code.scons
===================================================================
--- build/external_code.scons	(revision 12583)
+++ build/external_code.scons	(working copy)
@@ -1,28 +0,0 @@
-# Copyright (c) 2006-2008 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.
-
-__doc__ = """
-External code settings for Chromium builds.
-"""
-
-Import("env")
-
-if env.Bit('windows'):
-  env.Append(
-      CPPDEFINES = [
-          '_CRT_SECURE_NO_DEPRECATE',
-          '_CRT_NONSTDC_NO_WARNINGS',
-          '_CRT_NONSTDC_NO_DEPRECATE',
-          '_SCL_SECURE_NO_DEPRECATE',
-      ],
-      CCFLAGS = [
-          '/wd4800',
-      ],
-  )
-  env.FilterOut(
-      CCFLAGS = [
-        '/WX',      # VCCLCompilerTool.WarnAsError="false"
-        '/Wp64',    # VCCLCompilerTool.Detect64BitPortabilityProblems="false"
-      ],
-  )