Don't update height in LayoutBlock::markFixedPositionObjectForLayoutIfNeeded.

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index a240f8a112be65e8281829b5e91e3cc0048964ac..599c5ec4d7ad2e485a0f2c19eed9195c36ac21df 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -2886,9 +2886,7 @@ 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);
@@ -2901,6 +2899,13 @@ static inline Length heightForDocumentElement(const Document& document) {
 }
 
 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 {