Remove DialogElement runtime flag (status=stable)

Source/core/rendering/RenderView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@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
  * 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 160 matching lines @@
             positionDialog(box);
     }
 }
 
 void RenderView::layoutContent()
 {
     ASSERT(needsLayout());
 
     RenderBlockFlow::layout();
 
-    if (RuntimeEnabledFeatures::dialogElementEnabled())
-        positionDialogs();
+    positionDialogs();
 
 #if ENABLE(ASSERT)
     checkLayoutState();
 #endif
 }
 
 #if ENABLE(ASSERT)
 void RenderView::checkLayoutState()
 {
     ASSERT(!m_layoutState->next());
@@ skipping 798 matching lines @@
     return viewWidth(IncludeScrollbars) / scale;
 }
 
 double RenderView::layoutViewportHeight() const
 {
     float scale = m_frameView ? m_frameView->frame().pageZoomFactor() : 1;
     return viewHeight(IncludeScrollbars) / scale;
 }
 
 } // namespace blink