Revert of Optimize QuadF's PointIsInTriangle function

Revert of Optimize QuadF's PointIsInTriangle function (patchset #3 id:40001 of https://codereview.chromium.org/458173002/)

Reason for revert:
Caused perf regressions: https://code.google.com/p/chromium/issues/detail?id=404968

Original issue's description:
> Optimize QuadF's PointIsInTriangle function
>
> PointIsInTriangle() is still the hotspot of many CSS animation cases.Take Nexus10 with latest chromium build for example:
> 4.0%  case: poster-circle.html
> 1.5%  case: morphing-cubes.html
>
> This patch changes the algorithm of testing "Point In Triangle".
> 1. Using double-precision float point.
> 2. A much readable algorithm.
> 3. Better performance due to remove 2 div operation
>
> R=danakj@chromium.org
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=290290

TBR=kui.zheng@arm.com
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/9ab9844c93996eb2aafaaa0b653dcfa76ba9f340
Cr-Commit-Position: refs/heads/master@{#301455}

[danakj, 2014-10-27 21:44:43]

Created Revert of Optimize QuadF's PointIsInTriangle function

[commit-bot: I haz the power, 2014-10-27 21:47:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/682793003/1

[commit-bot: I haz the power, 2014-10-27 21:53:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-27 21:54:29]

Patchset 1 (id:??) landed as
https://crrev.com/9ab9844c93996eb2aafaaa0b653dcfa76ba9f340
Cr-Commit-Position: refs/heads/master@{#301455}