Margins that start at fragmentainer boundaries should be collapsed away.

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

Index: third_party/WebKit/Source/core/layout/LayoutBlock.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
index 1fdd61270cf2d2d861006e00cc170d0d3bc30b88..f114f6e851e59a1c0cb5009c86b51c763620edc6 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
@@ -1887,15 +1887,6 @@ LayoutBox* LayoutBlock::createAnonymousBoxWithSameTypeAs(
   return createAnonymousWithParentAndDisplay(parent, style()->display());
 }
 
-LayoutUnit LayoutBlock::nextPageLogicalTop(LayoutUnit logicalOffset) const {
-  LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset);
-  if (!pageLogicalHeight)
-    return logicalOffset;
-
-  return logicalOffset + pageRemainingLogicalHeightForOffset(
-                             logicalOffset, AssociateWithLatterPage);
-}
-
 void LayoutBlock::paginatedContentWasLaidOut(
     LayoutUnit logicalBottomOffsetAfterPagination) {
   if (LayoutFlowThread* flowThread = flowThreadContainingBlock())