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

base/omaha_version.h

-// Copyright 2007-2009 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_COMMON_OMAHA_VERSION_H__
-#define OMAHA_COMMON_OMAHA_VERSION_H__
-
-#include <windows.h>
-#include <tchar.h>
-
-namespace omaha {
-
-// Overloading on pointer types and integral types is not possible in this
-// case and generally speaking not a good idea anyway. It leads to either
-// compile time ambiguities or surprising results at runtime, such as
-// which overload is being called if foobar(NULL).
-
-// Initializes the version variables from the version resource of the module.
-void InitializeVersionFromModule(HINSTANCE instance);
-
-// Initializes the version variables from a ULONGLONG version.
-void InitializeVersion(ULONGLONG version);
-
-// Returns the version string as "major.minor.build.patch".
-const TCHAR* GetVersionString();
-
-// Returns the version string as a ULONGLONG.
-ULONGLONG GetVersion();
-
-}  // namespace omaha
-
-#endif  // OMAHA_COMMON_OMAHA_VERSION_H__