Remove unused code behind USE(PLATFORM_TEXT_TRACK_MENU)

Source/core/platform/graphics/PlatformTextTrackMenu.h

-/*
- * Copyright (C) 2013 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 PlatformTextTrackMenu_h
-#define PlatformTextTrackMenu_h
-
-#if USE(PLATFORM_TEXT_TRACK_MENU)
-
-#include "core/platform/graphics/PlatformTextTrack.h"
-#include <wtf/Noncopyable.h>
-#include <wtf/RefCounted.h>
-
-namespace WebCore {
-
-class PlatformTextTrack;
-
-class PlatformTextTrackMenuClient {
-public:
-    virtual ~PlatformTextTrackMenuClient() { }
-    
-    virtual void setSelectedTextTrack(PassRefPtr<PlatformTextTrack>) = 0;
-    virtual Vector<RefPtr<PlatformTextTrack> > platformTextTracks() = 0;
-};
-
-class PlatformTextTrackMenuInterface  : public RefCounted<PlatformTextTrackMenuInterface> {
-public:
-    explicit PlatformTextTrackMenuInterface() { }
-    virtual ~PlatformTextTrackMenuInterface() { }
-
-    virtual void tracksDidChange() = 0;
-    virtual void trackWasSelected(PassRefPtr<PlatformTextTrack>) = 0;
-    virtual void setClient(PlatformTextTrackMenuClient*) = 0;
-};
-
-}
-
-#endif // USE(PLATFORM_TEXT_TRACK_MENU)
-#endif // PlatformTextTrackMenu_h