Revert of Devtools Animations: Represent delay and end-delay on the animation timeline

Revert of Devtools Animations: Represent delay and end-delay on the animation timeline (patchset #3 id:60001 of https://codereview.chromium.org/967213002/)

Reason for revert:
This new layout test appears to fail pretty much everywhere, with minor floating-point rounding errors in the ~12th digit :).

Is it possible to write this test in a way that doesn't require so much precision in the output?

http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=inspector%2Felements%2Fanimation-timeline.html

Original issue's description:
> Devtools Animations: Represent delay and end-delay on the animation timeline
> 
> BUG=447083
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191387

TBR=pfeldman@chromium.org,samli@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=447083
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191395

[Dirk Pranke, 2015-03-06 00:37:15]

Created Revert of Devtools Animations: Represent delay and end-delay on the
animation timeline

[commit-bot: I haz the power, 2015-03-06 00:38:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/980053006/1

[commit-bot: I haz the power, 2015-03-06 00:38:56]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=191395

[pfeldman, 2015-03-06 05:05:39]

On 2015/03/06 00:38:56, I haz the power (commit-bot) wrote:
> Committed patchset #1 (id:1) as
> https://src.chromium.org/viewvc/blink?view=rev&revision=191395

I was actually sure it does not pass the try bots. Then I thought it would be a
good stress test for the system if it does :)