Revert of Remove 1 ms rounding up of task delays on Windows

Revert of Remove 1 ms rounding up of task delays on Windows (patchset #1 id:1 of https://codereview.chromium.org/1305873002/ )

Reason for revert:
Figuring out if this could cause Win10 failures: http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win10/builds/71

Original issue's description:
> Remove 1 ms rounding up of task delays on Windows
>
> Prior to a couple of attempts at fixing bug 487724 the message pump
> would sometimes end up spinning for up to a ms when waiting for a
> message's time to arrive. This was unintentional and non-obvious.
>
> The eventual fix was to round up the delay time to the next ms.
> Unfortunately this caused a regression in smoothness.top_25_smooth
> which has not been resolved (investigation was delayed due to some
> confusion about the results). Therefore this change reverts both
> fix attempts in order to leave time for a proper investigation and
> any necessary fixes.
>
> It is worth mentioning that the delay introduced by rounding up to 1
> ms is actually worse than expected on some operating systems. On Windows
> 7 a call to Sleep(1) will, if the timer frequency is raised, return
> within a ms. On Windows 8.1 it will often take two ms to return, which
> increases the delay. If the timer frequency is at its default interval
> of 15.625 ms then the delay can be longer.
>
> BUG=487724, 497536
>
> Committed: https://crrev.com/2b1bf190a079709a1a6a769bf86e782423d23121
> Cr-Commit-Position: refs/heads/master@{#344688}

TBR=rvargas@chromium.org,brucedawson@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=487724, 497536
Committed: https://crrev.com/189fc2149ec370a0a42b1bb63e9b49fa579aa1d7
Cr-Commit-Position: refs/heads/master@{#344798}

[pfeldman, 2015-08-21 17:09:23]

Created Revert of Remove 1 ms rounding up of task delays on Windows

[commit-bot: I haz the power, 2015-08-21 17:10:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304293002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304293002/1

[commit-bot: I haz the power, 2015-08-21 17:12:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-21 17:13:29]

Patchset 1 (id:??) landed as
https://crrev.com/189fc2149ec370a0a42b1bb63e9b49fa579aa1d7
Cr-Commit-Position: refs/heads/master@{#344798}

[brucedawson, 2015-08-24 17:36:57]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1311863002/ by brucedawson@chromium.org.

The reason for reverting is: The original change was reverted in error. The
Webkit Win10 builder has been hitting multiple failures for a long time. Neither
my change nor the revert affected this. And, the linked build failures
(builds/71) were before my change landed.

By reverting the revert of my undo of a previous change we are putting the code
back to its original state (see original description).

[pfeldman, 2015-08-24 17:38:39]

Sorry about that, at some point it seemed like the 1ms revert did help Win 10.