Don't require getPropertyCSSValue in animation fill-mode tests

Don't require getPropertyCSSValue in animation fill-mode tests

As getPropertyCSSValue is no longer web-exposed, we should stop testing
it so we can delete the interface. In animation fill-mode tests, it
isn't needed as we can just call parseFloat(style.left), as we always
return values in the format "123px" and parseFloat drops trailing
characters.

BUG=428595
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184976

[Timothy Loh, 2014-11-06 21:46:14]

timloh@chromium.org changed reviewers:
+ alancutter@chromium.org

[alancutter (OOO until 2018), 2014-11-07 04:21:08]

lgtm

[Timothy Loh, 2014-11-07 16:13:18]

The CQ bit was checked by timloh@chromium.org

[commit-bot: I haz the power, 2014-11-07 16:14:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/707713005/1

[commit-bot: I haz the power, 2014-11-07 17:04:12]

Committed patchset #1 (id:1) as 184976