Add back three deprecated DOM APIs removed from Chrome 34

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 76c8226625351c652b7e1aece5b45a94f44d6a08..b92891fbb332c1748f86f07bdfe1edf4cdd135ea 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -322,6 +322,7 @@ public:
     PassRefPtr<CDATASection> createCDATASection(const String& data, ExceptionState&);
     PassRefPtr<ProcessingInstruction> createProcessingInstruction(const String& target, const String& data, ExceptionState&);
     PassRefPtr<Attr> createAttribute(const AtomicString& name, ExceptionState&);
+    PassRefPtr<Attr> createAttributeNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState&, bool shouldIgnoreNamespaceChecks = false);
     PassRefPtr<Node> importNode(Node* importedNode, ExceptionState& ec) { return importNode(importedNode, true, ec); }
     PassRefPtr<Node> importNode(Node* importedNode, bool deep, ExceptionState&);
     PassRefPtr<Element> createElementNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState&);