Enabled using viewport on desktop browsers behind experimental flag

Source/core/platform/ScrollView.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 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
@@ skipping 194 matching lines @@
 
 IntRect ScrollView::visibleContentRect(VisibleContentRectIncludesScrollbars scollbarInclusion) const
 {
     FloatSize visibleContentSize = unscaledVisibleContentSize(scollbarInclusion);
     visibleContentSize.scale(1 / visibleContentScaleFactor());
     return IntRect(IntPoint(m_scrollOffset), expandedIntSize(visibleContentSize));
 }
 
 IntSize ScrollView::layoutSize(VisibleContentRectIncludesScrollbars scrollbarInclusion) const
 {
-    return m_fixedLayoutSize.isEmpty() || !m_useFixedLayout ? unscaledVisibleContentSize(scrollbarInclusion) : m_fixedLayoutSize;
-}
-
-IntSize ScrollView::fixedLayoutSize() const
-{
-    return m_fixedLayoutSize;
-}
-
-void ScrollView::setFixedLayoutSize(const IntSize& newSize)
-{
-    if (fixedLayoutSize() == newSize)
-        return;
-    m_fixedLayoutSize = newSize;
-    updateScrollbars(scrollOffset());
-    if (m_useFixedLayout)
-        contentsResized();
-}
-
-bool ScrollView::useFixedLayout() const
-{
-    return m_useFixedLayout;
-}
-
-void ScrollView::setUseFixedLayout(bool enable)
-{
-    if (useFixedLayout() == enable)
-        return;
-    m_useFixedLayout = enable;
-    updateScrollbars(scrollOffset());
-    contentsResized();
+    return unscaledVisibleContentSize(scrollbarInclusion);
 }
 
 IntSize ScrollView::contentsSize() const
 {
     return m_contentsSize;
 }
 
 void ScrollView::setContentsSize(const IntSize& newSize)
 {
     if (contentsSize() == newSize)
@@ skipping 914 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(scrollOffset());
 }
 
 }