Update remaining NodeTraversal / ElementTraversal methods to take references

Source/core/rendering/CounterNode.cpp

Index: Source/core/rendering/CounterNode.cpp
diff --git a/Source/core/rendering/CounterNode.cpp b/Source/core/rendering/CounterNode.cpp
index 53957f81e7abbdd40f61a56a4316ebc42377cbc1..87beb7fd627931c9faa6a09879b7981643c3dace 100644
--- a/Source/core/rendering/CounterNode.cpp
+++ b/Source/core/rendering/CounterNode.cpp
@@ -30,7 +30,7 @@
 
 namespace WebCore {
 
-CounterNode::CounterNode(RenderObject* o, bool hasResetType, int value)
+CounterNode::CounterNode(RenderObject& o, bool hasResetType, int value)
     : m_hasResetType(hasResetType)
     , m_value(value)
     , m_countInParent(0)
@@ -92,7 +92,7 @@ CounterNode::~CounterNode()
     resetRenderers();
 }
 
-PassRefPtr<CounterNode> CounterNode::create(RenderObject* owner, bool hasResetType, int value)
+PassRefPtr<CounterNode> CounterNode::create(RenderObject& owner, bool hasResetType, int value)
 {
     return adoptRef(new CounterNode(owner, hasResetType, value));
 }
@@ -367,7 +367,7 @@ static void showTreeAndMark(const CounterNode* node)
         fprintf(stderr, "%p %s: %d %d P:%p PS:%p NS:%p R:%p\n",
             current, current->actsAsReset() ? "reset____" : "increment", current->value(),
             current->countInParent(), current->parent(), current->previousSibling(),
-            current->nextSibling(), current->owner());
+            current->nextSibling(), &current->owner());
     }
     fflush(stderr);
 }