Simplify SMIL animation CSS property updates

After https://codereview.chromium.org/2251073002 we should no longer
need to walk any <use> instances "manually", since setNeedsStyleRecalc
does that already. This should also avoid the potential double-work
because of this.

TEST=svg/W3C-SVG-1.1/animate-elem-30-t.svg
TEST=svg/W3C-SVG-1.1/animate-elem-40-t.svg

BUG=166438,355359,484552,637310

Review-Url: https://codereview.chromium.org/2270363004
Cr-Commit-Position: refs/heads/master@{#414358}
1 file changed