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 ec64730d6dcc59174e89a37116f63c6143d1631d..3bcaa2c265520fb6eb220fb582d86234d2b8582a 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());