Remove the Pagination struct, clean up viewport scroll policy propagation.

Source/core/rendering/RenderLayerScrollableArea.cpp

Index: Source/core/rendering/RenderLayerScrollableArea.cpp
diff --git a/Source/core/rendering/RenderLayerScrollableArea.cpp b/Source/core/rendering/RenderLayerScrollableArea.cpp
index 15a49175a9f9d520c35803e46e8f5d9df69db35f..2d8f8b9e9fd0b3ca54d354835b175a7f97b6ffd2 100644
--- a/Source/core/rendering/RenderLayerScrollableArea.cpp
+++ b/Source/core/rendering/RenderLayerScrollableArea.cpp
@@ -680,6 +680,10 @@ void RenderLayerScrollableArea::updateAfterStyleChange(const RenderStyle* oldSty
     if (m_box->style()->appearance() == ListboxPart)
         return;
 
+    // RenderView shouldn't provide scrollbars on its own.
+    if (m_box->isRenderView())
+        return;
+
     if (!m_scrollDimensionsDirty)
         updateScrollableAreaSet(hasScrollableHorizontalOverflow() || hasScrollableVerticalOverflow());