Merge back LayoutLayerModelObject into RenderBoxModelObject

Source/core/layout/svg/LayoutSVGGradientStop.h

Index: Source/core/layout/svg/LayoutSVGGradientStop.h
diff --git a/Source/core/layout/svg/LayoutSVGGradientStop.h b/Source/core/layout/svg/LayoutSVGGradientStop.h
index d98354634c4e10b90b46833d1e80e53f0223b392..e2eb294938d1fe1b555323cf15d7fd56ccb6b776 100644
--- a/Source/core/layout/svg/LayoutSVGGradientStop.h
+++ b/Source/core/layout/svg/LayoutSVGGradientStop.h
@@ -42,7 +42,7 @@ public:
     // This overrides are needed to prevent ASSERTs on <svg><stop /></svg>
     // LayoutObject's default implementations ASSERT_NOT_REACHED()
     // https://bugs.webkit.org/show_bug.cgi?id=20400
-    virtual LayoutRect clippedOverflowRectForPaintInvalidation(const LayoutLayerModelObject*, const PaintInvalidationState* = 0) const override { return LayoutRect(); }
+    virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderBoxModelObject*, const PaintInvalidationState* = 0) const override { return LayoutRect(); }
     virtual FloatRect objectBoundingBox() const override { return FloatRect(); }
     virtual FloatRect strokeBoundingBox() const override { return FloatRect(); }
     virtual FloatRect paintInvalidationRectInLocalCoordinates() const override { return FloatRect(); }