Continue removing testing of getPropertyCSSValue

Continue removing testing of getPropertyCSSValue

As getPropertyCSSValue is no longer web-exposed, we should stop testing
it so we can delete the interface. Instead of using getPropertyCSSValue
and calling cssText on the returned value, we can use getPropertyValue
or the direct accessors.

BUG=428595
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184988

[Timothy Loh, 2014-11-06 21:37:58]

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

[alancutter (OOO until 2018), 2014-11-07 07:21:18]

lgtm, looks like some virtual expectations to update still.

[Timothy Loh, 2014-11-07 18:16:10]

The CQ bit was checked by timloh@chromium.org

[commit-bot: I haz the power, 2014-11-07 18:17:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/703323002/20001

[commit-bot: I haz the power, 2014-11-07 20:26:50]

Committed patchset #2 (id:20001) as 184988