Fix LayoutTest animation/timing-model.html

Some checks were failing because the test was incorrectly specifying a zero
iteration count.

According to the spec, 'the first value that can be parsed as a <time> is
assigned to the animation-duration, and the second value that can be parsed as
a <time> is assigned to animation-delay'. Since '0' (unlike other numbers
without units) can be parsed as a time, we need to explicitly specify both the
duration and delay before specifying an iteration count of zero.

Also re-order other property values to use a consistent ordering.

BUG=258896
R=dstockwell

Review URL: https://codereview.chromium.org/34973002

git-svn-id: svn://svn.chromium.org/blink/trunk@160199 bbb929c8-8fbe-4397-9dbb-9b2b20218538