Undoing instrumentations for task URLRequestSimpleJob::StartAsync

Undoing instrumentations for task URLRequestSimpleJob::StartAsync

After the fix, jankiness disappeared from this task.

BUG=422489
TBR=tony@chromium.org, danakj@chromium.org, thestig@chromium.org, finnur@chromium.org, michaeln@chromium.org, avi@chromium.org

Committed: https://crrev.com/fcefc83beb698980c4c3418374837b3efc6fb7b1
Cr-Commit-Position: refs/heads/master@{#305037}

[vadimt, 2014-11-20 16:09:39]

vadimt@chromium.org changed reviewers:
+ mmenke@chromium.org

[vadimt, 2014-11-20 16:09:39]

mmenke, please provide OWNER's approval for net/

Others: TBR, since changes are just undoing earlier changes.

[mmenke, 2014-11-20 16:29:48]

On 2014/11/20 16:09:39, vadimt wrote:
> mmenke, please provide OWNER's approval for net/
> 
> Others: TBR, since changes are just undoing earlier changes.

LGTM (And kudos for tracking down this stuff!)

[vadimt, 2014-11-20 16:47:59]

Thanks; but the game is not over, as you can see from
https://codereview.chromium.org/746483002/.
I, as a second thought, decided to insert more instrumentations to
net/url_request/url_request_simple_job.cc, and removed it from this CL.

However, I'm landing the remaining instrumentation removals.

[vadimt, 2014-11-20 16:48:06]

The CQ bit was checked by vadimt@chromium.org

[commit-bot: I haz the power, 2014-11-20 16:50:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/747443002/20001

[commit-bot: I haz the power, 2014-11-20 18:16:39]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-11-20 18:17:22]

Patchset 2 (id:??) landed as
https://crrev.com/fcefc83beb698980c4c3418374837b3efc6fb7b1
Cr-Commit-Position: refs/heads/master@{#305037}