Update remaining NodeTraversal / ElementTraversal methods to take references

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index 8d4c206705c11311f6a57aec6cd2dd28c5d29cce..a4b7d13e5d2836afeccba621e21ca5d50954815d 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -2047,7 +2047,7 @@ void RenderObject::styleDidChange(StyleDifference diff, const RenderStyle* oldSt
         return;
 
     if (diff == StyleDifferenceLayout || diff == StyleDifferenceSimplifiedLayout) {
-        RenderCounter::rendererStyleChanged(this, oldStyle, m_style.get());
+        RenderCounter::rendererStyleChanged(*this, oldStyle, m_style.get());
 
         // If the object already needs layout, then setNeedsLayout won't do
         // any work. But if the containing block has changed, then we may need
@@ -2580,7 +2580,7 @@ void RenderObject::willBeDestroyed()
     // this renderer had no parent at the time remove() was called.
 
     if (hasCounterNodeMap())
-        RenderCounter::destroyCounterNodes(this);
+        RenderCounter::destroyCounterNodes(*this);
 
     setAncestorLineBoxDirty(false);