Fix invalid selection produced when dragging mouse outside the SVG text element

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

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 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.
@@ skipping 96 matching lines @@
     const LayoutObject* pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&) const override;
 
     bool canBeSelectionLeaf() const override { return false; }
     bool canHaveChildren() const override { return true; }
 
     void descendantIsolationRequirementsChanged(DescendantIsolationState) final;
 
     void updateCachedBoundaries();
     void buildLocalToBorderBoxTransform();
 
+    PositionWithAffinity positionForPoint(const LayoutPoint&) final;
+
     LayoutObjectChildList m_children;
     IntSize m_containerSize;
     FloatRect m_objectBoundingBox;
     bool m_objectBoundingBoxValid;
     FloatRect m_strokeBoundingBox;
     FloatRect m_paintInvalidationBoundingBox;
     mutable AffineTransform m_localToParentTransform;
     AffineTransform m_localToBorderBoxTransform;
     bool m_isLayoutSizeChanged : 1;
     bool m_needsBoundariesOrTransformUpdate : 1;
     bool m_hasBoxDecorationBackground : 1;
     mutable bool m_hasNonIsolatedBlendingDescendants : 1;
     mutable bool m_hasNonIsolatedBlendingDescendantsDirty : 1;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGRoot, isSVGRoot());
 
 } // namespace blink
 
 #endif // LayoutSVGRoot_h