Remove some useless null checks in Element/NamedNodeMap

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 269 matching lines @@
     static bool parseAttributeName(QualifiedName&, const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState&);
     void setAttributeNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, const AtomicString& value, ExceptionState&);
 
     bool isIdAttributeName(const QualifiedName&) const;
     const AtomicString& getIdAttribute() const;
     void setIdAttribute(const AtomicString&);
 
     const AtomicString& getNameAttribute() const;
     const AtomicString& getClassAttribute() const;
 
+    bool shouldIgnoreAttributeCase() const;
+
     // Call this to get the value of the id attribute for style resolution purposes.
     // The value will already be lowercased if the document is in compatibility mode,
     // so this function is not suitable for non-style uses.
     const AtomicString& idForStyleResolution() const;
 
     // Internal methods that assume the existence of attribute storage, one should use hasAttributes()
     // before calling them.
     size_t attributeCount() const;
     const Attribute* attributeItem(unsigned index) const;
     const Attribute* getAttributeItem(const QualifiedName&) const;
@@ skipping 575 matching lines @@
 
 inline const AtomicString& Element::getClassAttribute() const
 {
     if (!hasClass())
         return nullAtom;
     if (isSVGElement())
         return getAttribute(HTMLNames::classAttr);
     return fastGetAttribute(HTMLNames::classAttr);
 }
 
+inline bool Element::shouldIgnoreAttributeCase() const
+{
+    return isHTMLElement() && document().isHTMLDocument();
+}
+
 inline void Element::setIdAttribute(const AtomicString& value)
 {
     setAttribute(document().idAttributeName(), value);
 }
 
 inline const SpaceSplitString& Element::classNames() const
 {
     ASSERT(hasClass());
     ASSERT(elementData());
     return elementData()->classNames();
@@ skipping 167 matching lines @@
 
 inline const Attribute* ElementData::attributeItem(unsigned index) const
 {
     RELEASE_ASSERT(index < length());
     return attributeBase() + index;
 }
 
 } // namespace
 
 #endif