Clarify comments for methods added in r178921

Source/core/svg/SVGElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009, 2014 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 216 matching lines @@
     // SVGFitToViewBox::parseAttribute uses reportAttributeParsingError.
     friend class SVGFitToViewBox;
     void reportAttributeParsingError(SVGParsingError, const QualifiedName&, const AtomicString&);
     bool hasFocusEventListeners() const;
 
 private:
     // FIXME: Author shadows should be allowed
     // https://bugs.webkit.org/show_bug.cgi?id=77938
     virtual bool areAuthorShadowsAllowed() const OVERRIDE FINAL { return false; }
 
-    bool isSVGElement() const WTF_DELETED_FUNCTION; // Hide to catch useless calls.
-    bool isStyledElement() const WTF_DELETED_FUNCTION; // Hide to catch useless calls.
+    bool isSVGElement() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
+    bool isStyledElement() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
 
     RenderStyle* computedStyle(PseudoId = NOPSEUDO);
     virtual RenderStyle* virtualComputedStyle(PseudoId pseudoElementSpecifier = NOPSEUDO) OVERRIDE FINAL { return computedStyle(pseudoElementSpecifier); }
     virtual void willRecalcStyle(StyleRecalcChange) OVERRIDE;
 
     void buildPendingResourcesIfNeeded();
 
     WillBeHeapHashSet<RawPtrWillBeWeakMember<SVGElement> > m_elementsWithRelativeLengths;
 
     typedef HashMap<QualifiedName, RefPtr<SVGAnimatedPropertyBase> > AttributeToPropertyMap;
@@ skipping 40 matching lines @@
     template<typename T> inline bool is##thisType(const PassRefPtr<T>& node) { return is##thisType(node.get()); } \
     template<typename T> inline bool is##thisType(const RefPtr<T>& node) { return is##thisType(node.get()); } \
     template <> inline bool isElementOfType<const thisType>(const SVGElement& element) { return is##thisType(element); } \
     DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 }
 
 #include "core/SVGElementTypeHelpers.h"
 
 #endif