Refactor to simplify how layerType is stored on PaintLayers.

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
index 6a795f67e699618fb651b9d3d7be0be9f15969f6..bf95cce6a1de7170528d797861933c750261b542 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
@@ -206,7 +206,7 @@ void LayoutBoxModelObject::styleDidChange(StyleDifference diff, const ComputedSt
         if (!layer() && layerCreationAllowedForSubtree()) {
             if (wasFloatingBeforeStyleChanged && isFloating())
                 setChildNeedsLayout();
-            createLayer(type);
+            createLayer();
             if (parent() && !needsLayout()) {
                 // FIXME: We should call a specialized version of this function.
                 layer()->updateLayerPositionsAfterLayout();
@@ -228,10 +228,6 @@ void LayoutBoxModelObject::styleDidChange(StyleDifference diff, const ComputedSt
     }
 
     if (layer()) {
-        // FIXME: Ideally we shouldn't need this setter but we can't easily infer an overflow-only layer
-        // from the style.
-        layer()->setLayerType(type);
-
         layer()->styleDidChange(diff, oldStyle);
         if (hadLayer && layer()->isSelfPaintingLayer() != layerWasSelfPainting)
             setChildNeedsLayout();
@@ -331,10 +327,10 @@ void LayoutBoxModelObject::invalidateStickyConstraints()
         ancestorOverflowLayer->getScrollableArea()->invalidateAllStickyConstraints();
 }
 
-void LayoutBoxModelObject::createLayer(PaintLayerType type)
+void LayoutBoxModelObject::createLayer()
 {
     ASSERT(!m_layer);
-    m_layer = adoptPtr(new PaintLayer(this, type));
+    m_layer = adoptPtr(new PaintLayer(this));
     setHasLayer(true);
     m_layer->insertOnlyThisLayerAfterStyleChange();
 }