Add explicit keyword to constructors that take one argument

Source/core/platform/animation/CSSAnimationDataList.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.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 17 matching lines @@
 #include "core/platform/animation/CSSAnimationData.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class CSSAnimationDataList {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     CSSAnimationDataList() { }
-    CSSAnimationDataList(const CSSAnimationDataList&);
+    explicit CSSAnimationDataList(const CSSAnimationDataList&);
 
     void fillUnsetProperties();
     bool operator==(const CSSAnimationDataList& o) const;
     bool operator!=(const CSSAnimationDataList& o) const
     {
         return !(*this == o);
     }
 
     size_t size() const { return m_animations.size(); }
     bool isEmpty() const { return m_animations.isEmpty(); }
 
     void resize(size_t n) { m_animations.resize(n); }
     void remove(size_t i) { m_animations.remove(i); }
     void append(PassRefPtr<CSSAnimationData> anim) { m_animations.append(anim); }
 
     CSSAnimationData* animation(size_t i) { return m_animations[i].get(); }
     const CSSAnimationData* animation(size_t i) const { return m_animations[i].get(); }
 
 private:
     CSSAnimationDataList& operator=(const CSSAnimationDataList&);
 
     Vector<RefPtr<CSSAnimationData> > m_animations;
 };
 
 
 } // namespace WebCore
 
 #endif // CSSAnimationDataList_h