[SVG] Support SMIL animating NewSVGProperty on <use> instantiated elements.

SVGAnimatedNewPropertyAnimator didn't handle SMIL animations on <use> instantiated elements properly. Specifically, when <animate> targeted an SVG element inside <defs>, the animation was not applied to <use> instantiated elements.

This patch addresses the issue by iterating over SVGElementAnimatedPropertyList previously ignored.

TESTS=LayoutTests/svg/W3C-SVG-1.1/animate-elem-30-t.svg
BUG=308818

Review URL: https://codereview.chromium.org/113303007

git-svn-id: svn://svn.chromium.org/blink/trunk@164566 bbb929c8-8fbe-4397-9dbb-9b2b20218538