SVGUseElement::invalidateShadowTree() should not check confusingAndOftenMisusedAttached()
SVGUseElement::invalidateShadowTree() should not check confusingAndOftenMisusedAttached()

This looks like it's trying to check inActiveDocument().

Review URL: https://codereview.chromium.org/51883012

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161019 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs