Revert 159083 "Reland Revert "Revert 157959 "Introduce a new ref..."

Causing ton of use-after-frees on ClusterFuzz.
BUG=305350

> Reland Revert "Revert 157959 "Introduce a new reference graph to SVG*TearOffs.""
> 
> Reland the patches. All known SVGProperty memory bugs were resolved.
> 
> SVGAnimatedListPropertyTearOff::clearAnimatedProperty modified to not detachListWrappers(). "clearAnimatedProperty" is only called from ~SVGElement and the context SVGElement is guaranteed to be alive while a tearoff is alive. There was no need to detachListWrappers to keep the list item tearoffs valid.
> 
> BUG=270000
> BUG=294464
> 
> R=pdr@chromium.org,haraken@chromium.org,inferno@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=158679
> 
> Review URL: https://codereview.chromium.org/25461003

TBR=kouhei@chromium.org

Review URL: https://codereview.chromium.org/26567002

git-svn-id: svn://svn.chromium.org/blink/trunk@159147 bbb929c8-8fbe-4397-9dbb-9b2b20218538