Revert of [SVG] Implement 'discard' element

Source/core/svg/SVGDiscardElement.h

-/*
- * Copyright (C) 2014 Samsung Electronics. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * 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.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
- * OWNER OR 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 SVGDiscardElement_h
-#define SVGDiscardElement_h
-
-#include "core/svg/animation/SVGSMILElement.h"
-
-namespace WebCore {
-
-class SVGDiscardElement FINAL : public SVGSMILElement {
-public:
-    static PassRefPtr<SVGDiscardElement> create(Document&);
-
-    virtual bool isSVGDiscardElement() const OVERRIDE { return true; }
-private:
-    explicit SVGDiscardElement(Document&);
-
-    virtual void resetAnimatedType() OVERRIDE { }
-    virtual void clearAnimatedType(SVGElement* targetElement) OVERRIDE { }
-    virtual void applyResultsToTarget() OVERRIDE { }
-    virtual bool hasValidAttributeType() OVERRIDE;
-    virtual bool hasValidAttributeName() OVERRIDE;
-    virtual void animationAttributeChanged() OVERRIDE { }
-
-    virtual void startedActiveInterval() OVERRIDE { }
-    virtual void updateAnimation(float percent, unsigned repeat, SVGSMILElement* resultElement) OVERRIDE { }
-};
-
-} // namespace WebCore
-
-#endif // SVGDiscardElement_h