Missing *explicit* keyword in constructors

Source/core/rendering/svg/RenderSVGImage.h

 /*
  * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
  * 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 15 matching lines @@
 
 #include "core/rendering/svg/RenderSVGModelObject.h"
 
 namespace WebCore {
 
 class RenderImageResource;
 class SVGImageElement;
 
 class RenderSVGImage FINAL : public RenderSVGModelObject {
 public:
-    RenderSVGImage(SVGImageElement*);
+    explicit RenderSVGImage(SVGImageElement*);
     virtual ~RenderSVGImage();
 
     bool updateImageViewport();
     virtual void setNeedsBoundariesUpdate() { m_needsBoundariesUpdate = true; }
     virtual bool needsBoundariesUpdate() OVERRIDE { return m_needsBoundariesUpdate; }
     virtual void setNeedsTransformUpdate() { m_needsTransformUpdate = true; }
 
     RenderImageResource* imageResource() { return m_imageResource.get(); }
     const RenderImageResource* imageResource() const { return m_imageResource.get(); }
 
@@ skipping 45 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGImage());
     return static_cast<const RenderSVGImage*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderSVGImage(const RenderSVGImage*);
 
 } // namespace WebCore
 
 #endif // RenderSVGImage_h