Revert of Changing setTimeout to not clamp delays to 1ms

Revert of Changing setTimeout to not clamp delays to 1ms minimum, since a 1ms clamp is not in the spec. (patchset #21 id:390001 of https://codereview.chromium.org/467153003/)

Reason for revert:
It broke setInterval(0) see https://code.google.com/p/chromium/issues/detail?id=434601

We need to decide what to do with setInterval(0) I can see some legitimate uses of that (e.g. implementing a scheduler in JS) but I can also see a lot of ways existing code may break.

Perhaps we still need the clamp for setInterval :(

Original issue's description:
> Changing setTimeout to not clamp delays to 1ms minimum, since a 1ms clamp is not in the spec.
> 
> ATTN Sheriffs: There is good probability that that this patch may have unintended side effects. For example there may be some JS tests that use setTimeout(...0) and hope that layout will occur.  With this patch that's much less likely to be the case and is actually a bug in the test.  I tried to fix some of those here https://codereview.chromium.org/644093003/
> 
> Another possibility is that something using setInterval(... 0) may suddenly show a perf regression due to running much more frequently.
> 
> BUG=402694
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185372

TBR=jochen@chromium.org,alexclarke@google.com,eseidel@chromium.org,jamesr@chromium.org,skyostil@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=402694
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185589

[alex clarke (OOO till 29th), 2014-11-19 12:18:26]

Created Revert of Changing setTimeout to not clamp delays to 1ms minimum, since
a 1ms clamp is not in the spec.

[commit-bot: I haz the power, 2014-11-19 12:19:18]

The CQ bit was unchecked by commit-bot@chromium.org

[Sami, 2014-11-19 13:42:38]

The CQ bit was checked by skyostil@chromium.org

[commit-bot: I haz the power, 2014-11-19 13:43:48]

The CQ bit was unchecked by commit-bot@chromium.org

[alexclarke, 2014-11-19 13:44:36]

The CQ bit was checked by alexclarke@google.com

[commit-bot: I haz the power, 2014-11-19 13:46:06]

The CQ bit was unchecked by commit-bot@chromium.org

[Sami, 2014-11-19 13:50:14]

lgtm.

[alex clarke (OOO till 29th), 2014-11-19 13:50:29]

The CQ bit was checked by alexclarke@chromium.org

[commit-bot: I haz the power, 2014-11-19 13:51:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/739813003/1

[commit-bot: I haz the power, 2014-11-19 13:52:06]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=185589