Need to reset enclosingPaginationLayer when a RenderLayer is removed from the tree.

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index 0f135d3588e9d45dae43856a9782ce5ec12f7086..454dad0fa0189c10750907a412feaad577ec0755 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -535,6 +535,13 @@ void RenderLayer::updatePagination()
     }
 }
 
+void RenderLayer::clearPaginationRecursive()
+{
+    m_enclosingPaginationLayer = 0;
+    for (RenderLayer* child = firstChild(); child; child = child->nextSibling())
+        child->clearPaginationRecursive();
+}
+
 LayoutPoint RenderLayer::positionFromPaintInvalidationBacking(const RenderObject* renderObject, const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState)
 {
     FloatPoint point = renderObject->localToContainerPoint(FloatPoint(), paintInvalidationContainer, 0, 0, paintInvalidationState);
@@ -1239,6 +1246,9 @@ RenderLayer* RenderLayer::removeChild(RenderLayer* oldChild)
     if (oldChild->m_hasVisibleContent || oldChild->m_hasVisibleDescendant)
         dirtyAncestorChainVisibleDescendantStatus();
 
+    if (oldChild->enclosingPaginationLayer())
+        oldChild->clearPaginationRecursive();
+
     return oldChild;
 }