Revert of Call directly to c callbacks in Invoke instead of transitioning to js and back out.

Revert of Call directly to c callbacks in Invoke instead of transitioning to js and back out. (patchset #9 id:150001 of https://codereview.chromium.org/864273002/)

Reason for revert:
threading4 flakiness

Original issue's description:
> Call directly to c callbacks in Invoke instead of transitioning to js and back out.
>
> BUG=
>
> Committed: https://crrev.com/ce457e2b596c3ccf5bf454eeed0969f3f3efd174
> Cr-Commit-Position: refs/heads/master@{#26231}

TBR=verwaest@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/5d14e4bcffea6c6c78ccc7815697444e3103279a
Cr-Commit-Position: refs/heads/master@{#26236}

[dcarney, 2015-01-23 08:53:12]

Created Revert of Call directly to c callbacks in Invoke instead of
transitioning to js and back out.

[commit-bot: I haz the power, 2015-01-23 08:54:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/873583003/1

[commit-bot: I haz the power, 2015-01-23 08:54:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-23 08:54:34]

Patchset 1 (id:??) landed as
https://crrev.com/5d14e4bcffea6c6c78ccc7815697444e3103279a
Cr-Commit-Position: refs/heads/master@{#26236}