Optimize for horizontal writing mode

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 2859 matching lines @@
 
     return renderView->style()->isHorizontalWritingMode();
 }
 
 bool FrameView::isFlippedDocument() const
 {
     RenderView* renderView = this->renderView();
     if (!renderView)
         return false;
 
-    return renderView->style()->isFlippedBlocksWritingMode();
+    return renderView->hasFlippedBlocksWritingMode();
 }
 
 bool FrameView::scrollbarsDisabled() const
 {
     if (!m_frame->settings() || !m_frame->settings()->pinchVirtualViewportEnabled())
         return false;
 
     return m_frame->isMainFrame() && ScrollbarTheme::theme()->usesOverlayScrollbars();
 }
 
@@ skipping 1112 matching lines @@
         return;
 
     ScrollableArea::setScrollOrigin(origin);
 
     // Update if the scroll origin changes, since our position will be different if the content size did not change.
     if (updatePositionAtAll && updatePositionSynchronously)
         updateScrollbars(scrollOffsetDouble());
 }
 
 } // namespace blink