Missing *explicit* keyword in constructors

Source/core/rendering/svg/RenderSVGResourceRadialGradient.h

 /*
  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 12 matching lines @@
 
 #include "core/rendering/svg/RenderSVGResourceGradient.h"
 #include "core/svg/RadialGradientAttributes.h"
 
 namespace WebCore {
 
 class SVGRadialGradientElement;
 
 class RenderSVGResourceRadialGradient FINAL : public RenderSVGResourceGradient {
 public:
-    RenderSVGResourceRadialGradient(SVGRadialGradientElement*);
+    explicit RenderSVGResourceRadialGradient(SVGRadialGradientElement*);
     virtual ~RenderSVGResourceRadialGradient();
 
     virtual const char* renderName() const { return "RenderSVGResourceRadialGradient"; }
 
     virtual RenderSVGResourceType resourceType() const { return s_resourceType; }
     static RenderSVGResourceType s_resourceType;
 
     virtual SVGUnitTypes::SVGUnitType gradientUnits() const { return m_attributes.gradientUnits(); }
     virtual void calculateGradientTransform(AffineTransform& transform) { transform = m_attributes.gradientTransform(); }
     virtual bool collectGradientAttributes(SVGGradientElement*);
     virtual void buildGradient(GradientData*) const;
 
     FloatPoint centerPoint(const RadialGradientAttributes&) const;
     FloatPoint focalPoint(const RadialGradientAttributes&) const;
     float radius(const RadialGradientAttributes&) const;
     float focalRadius(const RadialGradientAttributes&) const;
 
 private:
     RadialGradientAttributes m_attributes;
 };
 
 }
 
 #endif