Remove UnusedParam.h

Source/platform/scroll/ScrollAnimator.cpp

 /*
  * Copyright (c) 2010, Google 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:
  *
  *     * 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
@@ skipping 117 matching lines @@
 {
     m_currentPosX = position.x();
     m_currentPosY = position.y();
 }
 
 FloatPoint ScrollAnimator::currentPosition() const
 {
     return FloatPoint(m_currentPosX, m_currentPosY);
 }
 
-void ScrollAnimator::notifyPositionChanged(const FloatSize& delta)
+void ScrollAnimator::notifyPositionChanged(const FloatSize&)
 {
-    UNUSED_PARAM(delta);
     m_scrollableArea->setScrollOffsetFromAnimation(IntPoint(m_currentPosX, m_currentPosY));
 }
 
 float ScrollAnimator::clampScrollPosition(ScrollbarOrientation orientation, float pos)
 {
     float maxScrollPos = m_scrollableArea->maximumScrollPosition(orientation);
     float minScrollPos = m_scrollableArea->minimumScrollPosition(orientation);
     return std::max(std::min(pos, maxScrollPos), minScrollPos);
 }
 
 } // namespace WebCore