Let me raise the priority to P1.
See https://bugs.chromium.org/p/chromium/issues/detail?id=667324#c9.

Do SVG folks have a plan to work on this soon?

If you could expand on what you'd consider the "right management", then maybe.

Ah, that makes sense. :)

Let me assign this issue to me tentatively, as my backlog item.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/66a0e78c24b56758cd9733959f583e6e75fa2b66

commit 66a0e78c24b56758cd9733959f583e6e75fa2b66
Author: hayato <hayato@chromium.org>
Date: Wed Nov 30 10:14:02 2016

Stop a SVG <use> element from modifying its UA shadow tree when it is removed

Each element should not modify its UA shadow tree when being removed.
That is like a *double-free* because a super class's |removedFrom()| handles that.

BUG= 630870 , 637641 

Review-Url: https://codereview.chromium.org/2537143004
Cr-Commit-Position: refs/heads/master@{#435205}

[modify] https://crrev.com/66a0e78c24b56758cd9733959f583e6e75fa2b66/third_party/WebKit/Source/core/svg/SVGUseElement.cpp