Make sure AllowRepaintScope::m_originalValue is always initialized

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 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
@@ skipping 533 matching lines @@
     if (m_visuallyNonEmptyPixelCount > visualPixelThreshold)
         setIsVisuallyNonEmpty();
 }
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
 
 class AllowRepaintScope {
 public:
     explicit AllowRepaintScope(FrameView* view)
         : m_view(view)
+        , m_originalValue(view ? view->canRepaintDuringPerformLayout() : false)
     {
         if (!m_view)
             return;
 
-        m_originalValue = m_view->canRepaintDuringPerformLayout();
         m_view->setCanRepaintDuringPerformLayout(true);
     }
 
     ~AllowRepaintScope()
     {
         if (!m_view)
             return;
 
         m_view->setCanRepaintDuringPerformLayout(m_originalValue);
     }
 private:
     FrameView* m_view;
     bool m_originalValue;
 };
 
 } // namespace WebCore
 
 #endif // FrameView_h