Don't update height in LayoutBlock::markFixedPositionObjectForLayoutIfNeeded.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2868 matching lines @@
   // auto margins will just turn into 0.
   marginStart = marginStartWidth;
   marginEnd = marginEndWidth;
 }
 
 DISABLE_CFI_PERF
 void LayoutBox::updateLogicalHeight() {
   m_intrinsicContentLogicalHeight = contentLogicalHeight();
 
   LogicalExtentComputedValues computedValues;
-  LayoutUnit height = style()->containsSize() ? borderAndPaddingLogicalHeight()
-                                              : logicalHeight();
-  computeLogicalHeight(height, logicalTop(), computedValues);
+  computeLogicalHeight(computedValues);
 
   setLogicalHeight(computedValues.m_extent);
   setLogicalTop(computedValues.m_position);
   setMarginBefore(computedValues.m_margins.m_before);
   setMarginAfter(computedValues.m_margins.m_after);
 }
 
 static inline Length heightForDocumentElement(const Document& document) {
   return document.documentElement()->layoutObject()->style()->logicalHeight();
 }
 
 void LayoutBox::computeLogicalHeight(
+    LogicalExtentComputedValues& computedValues) const {
+  LayoutUnit height = style()->containsSize() ? borderAndPaddingLogicalHeight()
+                                              : logicalHeight();
+  computeLogicalHeight(height, logicalTop(), computedValues);
+}
+
+void LayoutBox::computeLogicalHeight(
     LayoutUnit logicalHeight,
     LayoutUnit logicalTop,
     LogicalExtentComputedValues& computedValues) const {
   computedValues.m_extent = logicalHeight;
   computedValues.m_position = logicalTop;
 
   // Cell height is managed by the table.
   if (isTableCell())
     return;
 
@@ skipping 2673 matching lines @@
   LayoutRect rect = frameRect();
 
   LayoutBlock* block = containingBlock();
   if (block)
     block->adjustChildDebugRect(rect);
 
   return rect;
 }
 
 }  // namespace blink