RenderStyle operator== incorrect for shape-outside and clip-path.

RenderStyle operator== incorrect for shape-outside and clip-path.

Use dataEquivalent instead of comparing pointers. Updating the base
RenderStyle in ActiveAnimations asserts that the cached base RenderStyle
is correct by comparing RenderStyle objects. It triggered an assert when
comparing two shape-outside values represented by different objects
representing the same value.

R=esprehn@chromium.org,dstockwell@chromium.org
BUG=425473
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184345

[rune, 2014-10-22 11:01:17]

I've looked through RefPtr and OwnPtr members in RenderStyle and friends and
didn't find more than these two that were wrong.

[rune, 2014-10-24 08:44:33]

PTAL

[dstockwell, 2014-10-24 08:55:36]

lgtm

[rune, 2014-10-24 08:56:45]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2014-10-24 08:57:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/669093002/1

[commit-bot: I haz the power, 2014-10-24 10:01:59]

Committed patchset #1 (id:1) as 184345