Use references in RenderBlock and RenderBlockFlow methods

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 1931eab5e6db5287c48500eb38c70f4011c633be..dd31d0080f92946750287476af55a052480dd231 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -1892,7 +1892,7 @@ void RenderBox::computeLogicalWidth(LogicalExtentComputedValues& computedValues)
 
     if (!hasPerpendicularContainingBlock && containerLogicalWidth && containerLogicalWidth != (computedValues.m_extent + computedValues.m_margins.m_start + computedValues.m_margins.m_end)
         && !isFloating() && !isInline() && !cb->isFlexibleBoxIncludingDeprecated() && !cb->isRenderGrid()) {
-        LayoutUnit newMargin = containerLogicalWidth - computedValues.m_extent - cb->marginStartForChild(this);
+        LayoutUnit newMargin = containerLogicalWidth - computedValues.m_extent - cb->marginStartForChild(*this);
         bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
         if (hasInvertedDirection)
             computedValues.m_margins.m_start = newMargin;
@@ -2593,8 +2593,8 @@ void RenderBox::computeAndSetBlockDirectionMargins(const RenderBlock* containing
         style()->marginAfterUsing(containingBlock->style()));
     // Note that in this 'positioning phase' of the layout we are using the containing block's writing mode rather than our own when calculating margins.
     // See http://www.w3.org/TR/2014/CR-css-writing-modes-3-20140320/#orthogonal-flows
-    containingBlock->setMarginBeforeForChild(this, marginBefore);
-    containingBlock->setMarginAfterForChild(this, marginAfter);
+    containingBlock->setMarginBeforeForChild(*this, marginBefore);
+    containingBlock->setMarginAfterForChild(*this, marginAfter);
 }
 
 LayoutUnit RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode) const