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

base/program_instance.h

-// Copyright 2005-2010 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.
-// ========================================================================
-
-#ifndef OMAHA_BASE_PROGRAM_INSTANCE_H_
-#define OMAHA_BASE_PROGRAM_INSTANCE_H_
-
-#include <atlstr.h>
-#include "base/basictypes.h"
-#include "omaha/third_party/smartany/auto_any.h"
-
-namespace omaha {
-
-  // Helps limit the number of instances of a program. The class itself does not
-  // limit the number of instances. The calling code is expected to take action
-  // based on the return of EnsureSingleInstance function.
-  class ProgramInstance {
-   public:
-    explicit ProgramInstance(const TCHAR* mutex_name)
-        : mutex_name_(mutex_name) {}
-    virtual ~ProgramInstance() {}
-    bool EnsureSingleInstance();
-   private:
-    bool CheckSingleInstance();
-    CString mutex_name_;
-    auto_mutex mutex_;
-    DISALLOW_EVIL_CONSTRUCTORS(ProgramInstance);
-  };
-
-}  // namespace omaha
-
-#endif  // OMAHA_BASE_PROGRAM_INSTANCE_H_