Check IsFixed specifically instead of presence of other flags.

third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) Research In Motion Limited 2011. 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
@@ skipping 330 matching lines @@
         rect.intersect(LayoutRect(pixelSnappedBorderBoxRect()));
 
     LayoutReplaced::mapToVisibleRectInAncestorSpace(ancestor, rect, paintInvalidationState);
 }
 
 // This method expects local CSS box coordinates.
 // Callers with local SVG viewport coordinates should first apply the localToBorderBoxTransform
 // to convert from SVG viewport coordinates to local CSS box coordinates.
 void LayoutSVGRoot::mapLocalToAncestor(const LayoutBoxModelObject* ancestor, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed, const PaintInvalidationState* paintInvalidationState) const
 {
-    ASSERT(mode & ~IsFixed); // We should have no fixed content in the SVG layout tree.
+    ASSERT(!(mode & IsFixed)); // We should have no fixed content in the SVG layout tree.
 
     LayoutReplaced::mapLocalToAncestor(ancestor, transformState, mode | ApplyContainerFlip, wasFixed, paintInvalidationState);
 }
 
 const LayoutObject* LayoutSVGRoot::pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap& geometryMap) const
 {
     return LayoutReplaced::pushMappingToContainer(ancestorToStopAt, geometryMap);
 }
 
 void LayoutSVGRoot::updateCachedBoundaries()
@@ skipping 37 matching lines @@
             updateHitTestResult(result, pointInBorderBox);
             if (result.addNodeToListBasedTestResult(node(), locationInContainer, boundsRect) == StopHitTesting)
                 return true;
         }
     }
 
     return false;
 }
 
 } // namespace blink