Need to remove line pagination struts when no longer fragmented.

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1105 matching lines @@
   //
   // FIXME: Another problem with simply moving lines is that the available line
   // width may change (because of floats). Technically if the location we move
   // the line to has a different line width than our old position, then we need
   // to dirty the line and all following lines.
   LayoutUnit logicalOffset = lineBox.lineTopWithLeading();
   LayoutUnit lineHeight = lineBox.lineBottomWithLeading() - logicalOffset;
   logicalOffset += delta;
   lineBox.setPaginationStrut(LayoutUnit());
   lineBox.setIsFirstAfterPageBreak(false);
+  if (!view()->layoutState()->isPaginated())
+    return;
   LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset);
   if (!pageLogicalHeight)
     return;
   LayoutUnit remainingLogicalHeight = pageRemainingLogicalHeightForOffset(
       logicalOffset, AssociateWithLatterPage);
   int lineIndex = lineCount(&lineBox);
   if (remainingLogicalHeight < lineHeight ||
       (shouldBreakAtLineToAvoidWidow() &&
        lineBreakToAvoidWidow() == lineIndex)) {
     LayoutUnit paginationStrut = calculatePaginationStrutToFitContent(
@@ skipping 3417 matching lines @@
   return LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
 }
 
 void LayoutBlockFlow::invalidateDisplayItemClients(
     PaintInvalidationReason invalidationReason) const {
   BlockFlowPaintInvalidator(*this).invalidateDisplayItemClients(
       invalidationReason);
 }
 
 }  // namespace blink