Delete blink code for scroll-blocks-on

Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 89 matching lines @@
 
 DeprecatedPaintLayerType LayoutBox::layerTypeRequired() const
 {
     // hasAutoZIndex only returns true if the element is positioned or a flex-item since
     // position:static elements that are not flex-items get their z-index coerced to auto.
     if (isPositioned() || createsGroup() || hasClipPath() || hasTransformRelatedProperty()
         || style()->hasCompositorProxy() || hasHiddenBackface() || hasReflection() || style()->specifiesColumns()
         || !style()->hasAutoZIndex() || style()->shouldCompositeForCurrentAnimations())
         return NormalDeprecatedPaintLayer;
 
-    // Ensure that explicit use of scroll-blocks-on creates a Layer (since we might need
-    // it to be composited).
-    if (style()->hasScrollBlocksOn()) {
-        if (isDocumentElement()) {
-            ASSERT(style()->scrollBlocksOn() == view()->style()->scrollBlocksOn());
-            return NoDeprecatedPaintLayer;
-        }
-        return NormalDeprecatedPaintLayer;
-    }
     if (hasOverflowClip())
         return OverflowClipDeprecatedPaintLayer;
 
     return NoDeprecatedPaintLayer;
 }
 
 void LayoutBox::willBeDestroyed()
 {
     clearOverrideSize();
     clearContainingBlockOverrideSize();
@@ skipping 4609 matching lines @@
     StyleImage* borderImage = style()->borderImage().image();
     return borderImage && borderImage->canRender(*this, style()->effectiveZoom()) && borderImage->isLoaded();
 }
 
 ShapeOutsideInfo* LayoutBox::shapeOutsideInfo() const
 {
     return ShapeOutsideInfo::isEnabledFor(*this) ? ShapeOutsideInfo::info(*this) : nullptr;
 }
 
 } // namespace blink