Allow objects without scrollbars to be scrollable

Source/WebKit/chromium/src/WebPluginScrollbarImpl.cpp

 /*
  * Copyright (C) 2012 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:
  * 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
@@ skipping 184 matching lines @@
 }
 
 void WebPluginScrollbarImpl::setLocation(const WebRect& rect)
 {
     IntRect oldRect = m_scrollbar->frameRect();
     m_scrollbar->setFrameRect(rect);
     if (WebRect(oldRect) != rect)
       m_scrollbar->invalidate();
 
     int length = m_scrollbar->orientation() == HorizontalScrollbar ? m_scrollbar->width() : m_scrollbar->height();
-    int pageStep = max(max(static_cast<int>(static_cast<float>(length) * Scrollbar::minFractionToStepWhenPaging()), length - Scrollbar::maxOverlapBetweenPages()), 1);
-    m_scrollbar->setSteps(Scrollbar::pixelsPerLineStep(), pageStep);
     m_scrollbar->setEnabled(m_scrollbar->totalSize() > length);
     m_scrollbar->setProportion(length, m_scrollbar->totalSize());
 }
 
 void WebPluginScrollbarImpl::setValue(int position)
 {
     m_group->scrollToOffsetWithoutAnimation(m_scrollbar->orientation(), static_cast<float>(position));
 }
 
 void WebPluginScrollbarImpl::setDocumentSize(int size)
@@ skipping 145 matching lines @@
     WebCore::ScrollDirection scrollDirection;
     WebCore::ScrollGranularity scrollGranularity;
     if (WebViewImpl::mapKeyCodeForScroll(keyCode, &scrollDirection, &scrollGranularity)) {
         // Will return false if scroll direction wasn't compatible with this scrollbar.
         return m_group->scroll(scrollDirection, scrollGranularity);
     }
     return false;
 }
 
 } // namespace WebKit