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

base/user_info.h

-// Copyright 2004-2010 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.
-// ========================================================================
-//
-// Class UserInfo: Information related to the current user or other users on
-// this machine.
-//
-// TODO(omaha): seems we can merge this module with user_rights.
-
-#ifndef OMAHA_COMMON_USER_INFO_H__
-#define OMAHA_COMMON_USER_INFO_H__
-
-#include <windows.h>
-#include <atlsecurity.h>
-#include <atlstr.h>
-
-namespace omaha {
-
-namespace user_info {
-
-// Gets the user name, domain, and the SID associated with the access token
-// of the current process.
-HRESULT GetProcessUser(CString* name, CString* domain, CString* sid);
-
-// Gets SID associated with the access token of the current process.
-HRESULT GetProcessUserSid(CSid* sid);
-
-// Gets the user SID associated with the access token of the current thread if
-// the thread is impersonating. If the thread is not impersonating, the API
-// fails with ERROR_NO_TOKEN.
-HRESULT GetThreadUserSid(CString* sid);
-
-// Gets the user SID associated with the access token of the current thread if
-// the thread is impersonating. Otherwise, gets the SID associated with the
-// access token of the current process.
-HRESULT GetEffectiveUserSid(CString* sid);
-
-// TODO(omaha): deprecate weird API.
-// Looks at the current user SID and checks if it's the same as the
-// LocalSystem user.
-HRESULT IsLocalSystemUser(bool* is_local_system,
-                          CString* user_sid);     // optional.
-
-// Returns true if the caller's impersonation or process access token user
-// is LOCAL_SYSTEM.
-bool IsRunningAsSystem();
-
-// Returns true if the current thread is impersonating.
-bool IsThreadImpersonating();
-
-}  // namespace user_info
-
-}  // namespace omaha
-
-#endif  // OMAHA_COMMON_USER_INFO_H__