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

site_scons/site_init.py

-#!/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.
-# ========================================================================
-
-"""Omaha site init for SCons."""
-
-# Nothing to see here.  This file just needs to exist so that SCons can load
-# the tools in the site_scons subdirectory.  Customization of environments and
-# their methods should be done via those tools.