Remove stale comment about Node::insertBefore and friends

It was added in 2006 <https://trac.webkit.org/changeset/12568> and was
accurate at the time.

Review URL: https://codereview.chromium.org/939303004

git-svn-id: svn://svn.chromium.org/blink/trunk@190721 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/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);