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 1bb397c2e1aa055fe2e43a371ea1a868323d6e2e..ff1a87498943c4f9c85df2fc5a70e51306c20210 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -1611,7 +1611,7 @@ void RenderBox::positionLineBox(InlineBox* box)
             // our object was inline originally, since otherwise it would have ended up underneath
             // the inlines.
             RootInlineBox& root = box->root();
-            root.block().setStaticInlinePositionForChild(this, LayoutUnit::fromFloatRound(box->logicalLeft()));
+            root.block().setStaticInlinePositionForChild(*this, LayoutUnit::fromFloatRound(box->logicalLeft()));
             if (style()->hasStaticInlinePosition(box->isHorizontal()))
                 setChildNeedsLayout(MarkOnlyThis); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
         } else {
@@ -1891,7 +1891,7 @@ 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;
@@ -2590,8 +2590,8 @@ 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