Revert of Try changing LockImpl to not have a spin count to see how it affects performance.

Revert of Try changing LockImpl to not have a spin count to see how it affects performance. (patchset #1 id:1 of https://codereview.chromium.org/1333053002/ )

Reason for revert:
didn't make any difference

Original issue's description:
> Try changing LockImpl to not have a spin count to see how it affects performance.
>
> This was last change 7 years ago, and we have grown a lot of usages of locks since then. Since we don't use pthread_spin_lock on posix, I'm curious how this affects performance today on Windows.
>
> Committed: https://crrev.com/00c9ca679badffc7584439fff00f18cb3977d5da
> Cr-Commit-Position: refs/heads/master@{#348280}

TBR=cpu@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/61f5ad7107405f414b1b14ddff712388ecece98c
Cr-Commit-Position: refs/heads/master@{#348417}

[jam, 2015-09-11 17:05:49]

Created Revert of Try changing LockImpl to not have a spin count to see how it
affects performance.

[commit-bot: I haz the power, 2015-09-11 17:06:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1340653003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1340653003/1

[commit-bot: I haz the power, 2015-09-11 17:07:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-11 17:08:00]

Patchset 1 (id:??) landed as
https://crrev.com/61f5ad7107405f414b1b14ddff712388ecece98c
Cr-Commit-Position: refs/heads/master@{#348417}

[commit-bot: I haz the power, 2015-09-23 12:23:20]

Patchset 1 (id:??) landed as
https://crrev.com/61f5ad7107405f414b1b14ddff712388ecece98c
Cr-Commit-Position: refs/heads/master@{#348417}