Gardening. Remove stale expectation for svg-stroke-dasharray-interpolation.html, this test always passes under web-animations.

NOTRY=true
TBR=shans@chromium.org
BUG=305070

Review URL: https://codereview.chromium.org/138023003

git-svn-id: svn://svn.chromium.org/blink/trunk@165063 bbb929c8-8fbe-4397-9dbb-9b2b20218538