Revert NotImplemented() changes in r383029 and r383047.

third_party/WebKit/Source/core/dom/Node.cpp

Index: third_party/WebKit/Source/core/dom/Node.cpp
diff --git a/third_party/WebKit/Source/core/dom/Node.cpp b/third_party/WebKit/Source/core/dom/Node.cpp
index 629b64f72490b07bafb5ea768b48e14b3bf93398..04bfecc398e49c0c402a70089a50983906e22d16 100644
--- a/third_party/WebKit/Source/core/dom/Node.cpp
+++ b/third_party/WebKit/Source/core/dom/Node.cpp
@@ -1518,6 +1518,8 @@ String Node::debugNodeName() const
     return nodeName();
 }
 
+#ifndef NDEBUG
+
 static void appendAttributeDesc(const Node* node, StringBuilder& stringBuilder, const QualifiedName& name, const char* attrDesc)
 {
     if (!node->isElementNode())
@@ -1533,28 +1535,6 @@ static void appendAttributeDesc(const Node* node, StringBuilder& stringBuilder,
     stringBuilder.appendLiteral("\"");
 }
 
-// |std::ostream| version of |Node::showNode|
-std::ostream& operator<<(std::ostream& ostream, const Node& node)
-{
-    ostream << node.nodeName();
-    if (node.isTextNode())
-        return ostream << " " << node.nodeValue();
-    StringBuilder attrs;
-    appendAttributeDesc(&node, attrs, HTMLNames::idAttr, " ID");
-    appendAttributeDesc(&node, attrs, HTMLNames::classAttr, " CLASS");
-    appendAttributeDesc(&node, attrs, HTMLNames::styleAttr, " STYLE");
-    return ostream << attrs.toString();
-}
-
-std::ostream& operator<<(std::ostream& ostream, const Node* node)
-{
-    if (!node)
-        return ostream << "null";
-    return ostream << *node;
-}
-
-#ifndef NDEBUG
-
 void Node::showNode(const char* prefix) const
 {
     if (!prefix)