Delete blink code for scroll-blocks-on

Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 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 214 matching lines @@
     m_graphicsLayer = createGraphicsLayer(m_owningLayer.compositingReasons());
 
     updateOpacity(layoutObject()->styleRef());
     updateTransform(layoutObject()->styleRef());
     updateFilters(layoutObject()->styleRef());
 
     if (RuntimeEnabledFeatures::cssCompositingEnabled()) {
         updateLayerBlendMode(layoutObject()->styleRef());
         updateIsRootForIsolatedGroup();
     }
-
-    updateScrollBlocksOn(layoutObject()->styleRef());
 }
 
 void CompositedDeprecatedPaintLayerMapping::destroyGraphicsLayers()
 {
     if (m_graphicsLayer)
         m_graphicsLayer->removeFromParent();
 
     m_ancestorClippingLayer = nullptr;
     m_graphicsLayer = nullptr;
     m_foregroundLayer = nullptr;
@@ skipping 39 matching lines @@
 void CompositedDeprecatedPaintLayerMapping::updateIsRootForIsolatedGroup()
 {
     bool isolate = m_owningLayer.shouldIsolateCompositedDescendants();
 
     // non stacking context layers should never isolate
     ASSERT(m_owningLayer.stackingNode()->isStackingContext() || !isolate);
 
     m_graphicsLayer->setIsRootForIsolatedGroup(isolate);
 }
 
-void CompositedDeprecatedPaintLayerMapping::updateScrollBlocksOn(const ComputedStyle& style)
-{
-    // Note that blink determines the default scroll blocking policy, even
-    // when the scroll-blocks-on CSS feature isn't enabled.
-    WebScrollBlocksOn blockingMode = WebScrollBlocksOnStartTouch | WebScrollBlocksOnWheelEvent;
-
-    if (RuntimeEnabledFeatures::cssScrollBlocksOnEnabled())
-        blockingMode = style.scrollBlocksOn();
-
-    m_graphicsLayer->setScrollBlocksOn(blockingMode);
-}
-
 void CompositedDeprecatedPaintLayerMapping::updateContentsOpaque()
 {
     ASSERT(m_isMainFrameLayoutViewLayer || !m_backgroundLayer);
     if (isAcceleratedCanvas(layoutObject())) {
         // Determine whether the rendering context's external texture layer is opaque.
         CanvasRenderingContext* context = toHTMLCanvasElement(layoutObject()->node())->renderingContext();
         if (!context->hasAlpha())
             m_graphicsLayer->setContentsOpaque(true);
         else if (WebLayer* layer = context->platformLayer())
             m_graphicsLayer->setContentsOpaque(!Color(layer->backgroundColor()).hasAlpha());
@@ skipping 410 matching lines @@
     updateBackgroundColor();
     updateDrawsContent();
     updateContentsOpaque();
     updateAfterPartResize();
     updateRenderingContext();
     updateShouldFlattenTransform();
     updateChildrenTransform();
     updateScrollParent(scrollParent());
     registerScrollingLayers();
 
-    updateScrollBlocksOn(layoutObject()->styleRef());
-
     updateCompositingReasons();
 }
 
 void CompositedDeprecatedPaintLayerMapping::updateMainGraphicsLayerGeometry(const IntRect& relativeCompositingBounds, const IntRect& localCompositingBounds, const IntPoint& graphicsLayerParentLocation)
 {
     m_graphicsLayer->setPosition(FloatPoint(relativeCompositingBounds.location() - graphicsLayerParentLocation));
     m_graphicsLayer->setOffsetFromLayoutObject(toIntSize(localCompositingBounds.location()));
 
     FloatSize oldSize = m_graphicsLayer->size();
     const IntSize& contentsSize = relativeCompositingBounds.size();
@@ skipping 1622 matching lines @@
     } else if (graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
         name = "Scrolling Block Selection Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink