Remove stale comment about Node::insertBefore and friends

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 34689133d4f118d597cb380d9bfffcdb4a015276..b0b0cf08fb0f52d0a0d761302d3362d2b45e3522 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -205,8 +205,6 @@ public:
 
     virtual KURL baseURI() const;
 
-    // These should all actually return a node, but this is only important for language bindings,
-    // which will already know and hold a ref on the right node to return.
     PassRefPtrWillBeRawPtr<Node> insertBefore(PassRefPtrWillBeRawPtr<Node> newChild, Node* refChild, ExceptionState& = ASSERT_NO_EXCEPTION);
     PassRefPtrWillBeRawPtr<Node> replaceChild(PassRefPtrWillBeRawPtr<Node> newChild, PassRefPtrWillBeRawPtr<Node> oldChild, ExceptionState& = ASSERT_NO_EXCEPTION);
     PassRefPtrWillBeRawPtr<Node> removeChild(PassRefPtrWillBeRawPtr<Node> child, ExceptionState& = ASSERT_NO_EXCEPTION);