INPUT element: Fix a DCHECK failure in RadioInputType::findNextFocusableRadioButtonInGroup.

third_party/WebKit/Source/core/html/HTMLInputElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. 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 HTMLInputElement_h
 #define HTMLInputElement_h
 
+#include "base/gtest_prod_util.h"
 #include "core/CoreExport.h"
 #include "core/html/TextControlElement.h"
 #include "core/html/forms/StepRange.h"
 #include "platform/FileChooser.h"
 
 namespace blink {
 
 class AXObject;
 class DragData;
 class ExceptionState;
@@ skipping 384 matching lines @@
   unsigned m_needsToUpdateViewValue : 1;
   unsigned m_isPlaceholderVisible : 1;
   Member<InputType> m_inputType;
   Member<InputTypeView> m_inputTypeView;
   // The ImageLoader must be owned by this element because the loader code
   // assumes that it lives as long as its owning element lives. If we move the
   // loader into the ImageInput object we may delete the loader while this
   // element lives on.
   Member<HTMLImageLoader> m_imageLoader;
   Member<ListAttributeTargetObserver> m_listAttributeTargetObserver;
+
+  FRIEND_TEST_ALL_PREFIXES(HTMLInputElementTest, RadioKeyDownDCHECKFailure);
 };
 
 }  // namespace blink
 
 #endif  // HTMLInputElement_h