Remove memory cache from system URLRequestContext.

Remove memory cache from system URLRequestContext.

One was accidentally added in
https://codereview.chromium.org/2939733002/. Previously, it had no
cache.

BUG=734619
Review-Url: https://codereview.chromium.org/2945083002
Cr-Commit-Position: refs/heads/master@{#480874}
Committed: https://chromium.googlesource.com/chromium/src/+/333204ddfbcca26725a7a9d86023de3828f95701

[mmenke, 2017-06-20 16:16:19]

The CQ bit was checked by mmenke@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-06-20 16:16:38]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[mmenke, 2017-06-20 16:20:06]

The CQ bit was checked by mmenke@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-06-20 16:20:21]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[mmenke, 2017-06-20 16:44:36]

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

[mmenke, 2017-06-20 16:44:37]

I had just assumed the system URLRequestContext had an in-memory cache before. 
I was wrong.  :(

[Randy Smith (Not in Mondays), 2017-06-20 17:01:03]

Oops.  LGTM.

[mmenke, 2017-06-20 17:02:18]

The CQ bit was unchecked by mmenke@chromium.org

[mmenke, 2017-06-20 17:02:24]

The CQ bit was checked by mmenke@chromium.org

[commit-bot: I haz the power, 2017-06-20 17:02:39]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-20 17:52:11]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1497978144662310,
"parent_rev": "f03bf279dbfb0d8324cf4894fe357ff1b1ec690e", "commit_rev":
"333204ddfbcca26725a7a9d86023de3828f95701"}

[commit-bot: I haz the power, 2017-06-20 17:52:23]

Description was changed from

==========
Remove memory cache from system URLRequestContext.

One was accidentally added in
https://codereview.chromium.org/2939733002/. Previously, it had no
cache.

BUG=734619
==========

to

==========
Remove memory cache from system URLRequestContext.

One was accidentally added in
https://codereview.chromium.org/2939733002/. Previously, it had no
cache.

BUG=734619

Review-Url: https://codereview.chromium.org/2945083002
Cr-Commit-Position: refs/heads/master@{#480874}
Committed:
https://chromium.googlesource.com/chromium/src/+/333204ddfbcca26725a7a9d86023...
==========

[commit-bot: I haz the power, 2017-06-20 17:52:28]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/333204ddfbcca26725a7a9d86023...

[mmenke, 2017-06-20 17:55:23]

On 2017/06/20 17:52:28, commit-bot: I haz the power wrote:
> Committed patchset #2 (id:20001) as
>
https://chromium.googlesource.com/chromium/src/+/333204ddfbcca26725a7a9d86023...

Oops.  commit message blamed the regression on the wrong CL.  :)