Make preferred widths for replaced content independent on available width

Source/core/rendering/RenderReplaced.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011-2012. 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.
@@ skipping 383 matching lines @@
             // of 'width' is: (used height) * (intrinsic ratio)
             if (intrinsicRatio && ((computedHeightIsAuto && !hasIntrinsicWidth && hasIntrinsicHeight) || !computedHeightIsAuto)) {
                 LayoutUnit logicalHeight = computeReplacedLogicalHeight();
                 return computeReplacedLogicalWidthRespectingMinMaxWidth(roundToInt(round(logicalHeight * intrinsicRatio)), shouldComputePreferred);
             }
 
             // If 'height' and 'width' both have computed values of 'auto' and the element has an intrinsic ratio but no intrinsic height or width, then the used value of
             // 'width' is undefined in CSS 2.1. However, it is suggested that, if the containing block's width does not itself depend on the replaced element's width, then
             // the used value of 'width' is calculated from the constraint equation used for block-level, non-replaced elements in normal flow.
             if (computedHeightIsAuto && !hasIntrinsicWidth && !hasIntrinsicHeight) {
+                if (shouldComputePreferred == ComputePreferred)
+                    return 0;
                 // The aforementioned 'constraint equation' used for block-level, non-replaced elements in normal flow:
                 // 'margin-left' + 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' + 'margin-right' = width of containing block
                 LayoutUnit logicalWidth;
                 // FIXME: This walking up the containgBlock chain to find the first one with a specified width is bonkers.
                 // If nothing else, it requires making sure that computeReplacedLogicalWidthRespectingMinMaxWidth cannot
                 // depend on the width of the replaced element or we infinite loop. Right now we do that in
                 // firstContainingBlockWithLogicalWidth by checking that width/min-width/max-width are all specified.
                 //
                 // Firefox 27 seems to only do this if the <svg> has a viewbox.
                 if (RenderBlock* blockWithWidth = firstContainingBlockWithLogicalWidth(this)) {
@@ skipping 209 matching lines @@
         // FIXME: layoutDelta needs to be applied in parts before/after transforms and
         // repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
         r.move(v->layoutDelta());
     }
 
     mapRectToPaintInvalidationBacking(paintInvalidationContainer, r);
     return r;
 }
 
 }