Remove BinarySemaphore, which is unused.

Source/WTF/wtf/threads/BinarySemaphore.h

-/*
- * Copyright (C) 2010, 2011 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
- * THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef BinarySemaphore_h
-#define BinarySemaphore_h
-
-#include <wtf/Noncopyable.h>
-#include <wtf/ThreadingPrimitives.h>
-
-namespace WTF {
-
-class BinarySemaphore {
-    WTF_MAKE_NONCOPYABLE(BinarySemaphore);
-
-public:
-    BinarySemaphore();
-    ~BinarySemaphore();
-
-    void signal();
-    bool wait(double absoluteTime);
-
-#if PLATFORM(WIN)
-    HANDLE event() const { return m_event; }
-#endif
-
-private:
-#if PLATFORM(WIN)
-    HANDLE m_event;
-#else
-    bool m_isSet;
-
-    Mutex m_mutex;
-    ThreadCondition m_condition;
-#endif
-};
-
-} // namespace WTF
-
-using WTF::BinarySemaphore;
-
-#endif // BinarySemaphore_h