Oilpan: cleanup based on review comments after removal of TreeShared.

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index 722b359b3028b3d384725621404ba8170b6ad0b0..602f0373ed3407dd1f1363270314f475e0e80f46 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -907,11 +907,6 @@ inline bool operator==(const Node* a, const Node& b) { return a == &b; }
 inline bool operator!=(const Node& a, const Node& b) { return !(a == b); }
 inline bool operator!=(const Node& a, const Node* b) { return !(a == b); }
 inline bool operator!=(const Node* a, const Node& b) { return !(a == b); }
-inline bool operator==(const PassRefPtr<Node>& a, const Node& b) { return a.get() == &b; }
-inline bool operator==(const Node& a, const PassRefPtr<Node>& b) { return &a == b.get(); }
-inline bool operator!=(const PassRefPtr<Node>& a, const Node& b) { return !(a == b); }
-inline bool operator!=(const Node& a, const PassRefPtr<Node>& b) { return !(a == b); }
-
 
 #define DEFINE_NODE_TYPE_CASTS(thisType, predicate) \
     template<typename T> inline thisType* to##thisType(const RefPtr<T>& node) { return to##thisType(node.get()); } \