First round of dead file removal

experimental/conways_life/threading/scoped_mutex_lock.h

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef SCOPED_MUTEX_LOCK_H_
-#define SCOPED_MUTEX_LOCK_H_
-
-#include "experimental/conways_life/threading/pthread_ext.h"
-
-namespace threading {
-// A small helper RAII class that implements a scoped pthread_mutex lock.
-class ScopedMutexLock {
- public:
-  explicit ScopedMutexLock(pthread_mutex_t* mutex) : mutex_(mutex) {
-    if (pthread_mutex_lock(mutex_) != PTHREAD_MUTEX_SUCCESS) {
-      mutex_ = NULL;
-    }
-  }
-  ~ScopedMutexLock() {
-    if (mutex_)
-      pthread_mutex_unlock(mutex_);
-  }
-  bool is_valid() const {
-    return mutex_ != NULL;
-  }
- private:
-  pthread_mutex_t* mutex_;  // Weak reference.
-};
-}  // namespace threading
-
-#endif  // SCOPED_MUTEX_LOCK_H_
-