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

google_update/precompile.h

-// Copyright 2008-2009 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.
-// ========================================================================
-
-#ifndef OMAHA_GOOGLE_UPDATE_PRECOMPILE_H__
-#define OMAHA_GOOGLE_UPDATE_PRECOMPILE_H__
-
-#pragma runtime_checks("", off)
-
-#ifndef WIN32_LEAN_AND_MEAN
-#define WIN32_LEAN_AND_MEAN
-#endif
-
-#include <windows.h>
-#include <shlwapi.h>
-#include <tchar.h>
-
-#pragma warning(push)
-// C4310: cast truncates constant value
-#pragma warning(disable : 4310)
-#include "base/basictypes.h"
-#pragma warning(pop)
-
-#endif  // OMAHA_GOOGLE_UPDATE_PRECOMPILE_H__