Missing *explicit* keyword in constructors

Source/core/rendering/svg/RenderSVGTextPath.h

 /*
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2009 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef RenderSVGTextPath_h
 #define RenderSVGTextPath_h
 
 #include "core/rendering/svg/RenderSVGInline.h"
 
 namespace WebCore {
 
 class RenderSVGTextPath FINAL : public RenderSVGInline {
 public:
-    RenderSVGTextPath(Element*);
+    explicit RenderSVGTextPath(Element*);
 
     Path layoutPath() const;
     float startOffset() const;
     bool exactAlignment() const;
     bool stretchMethod() const;
 
     virtual bool isSVGTextPath() const { return true; }
 
 private:
     virtual const char* renderName() const { return "RenderSVGTextPath"; }
 
     Path m_layoutPath;
 };
 
 inline RenderSVGTextPath* toRenderSVGTextPath(RenderObject* object)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGTextPath());
     return static_cast<RenderSVGTextPath*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderSVGTextPath(const RenderSVGTextPath*);
 
 }
 
 #endif // RenderSVGTextPath_h