Keep only base/extractor.[cc|h].

base/security/build.scons

-#!/usr/bin/python2.4
-#
-# Copyright 2009 Google Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-# ========================================================================
-
-Import('env')
-
-#
-# Build Security library
-#
-security_env = env.Clone()
-
-security_env.Append(
-    CPPPATH = [
-        '$MAIN_DIR/third_party/c99/include',
-        ],
-    CCFLAGS = [
-        '/wd4242',  # conversion from 'type1' to 'type2', possible loss of data
-        '/wd4244',  # conversion from 'type1' to 'type2', possible loss of data
-        '/wd4510',  # default constructor could not be generated
-        '/wd4610',  # object 'class' can never be instantiated
-        ],
-)
-
-
-security_inputs = [
-    'aes.c',
-    'b64.c',
-    'challenger.cc',
-    'hmac.c',
-    'md5.c',
-    'rc4.c',
-    'rsa.cc',
-    'sha.c',
-    ]
-
-# Precompiled headers cannot be used with C files.
-security_env.ComponentStaticLibrary('security',
-                                    security_inputs,
-                                    use_pch_default=False)