Reland of "Remove mutex locks in SchemeRegistry"

Reland of "Remove mutex locks in SchemeRegistry"

This reverts commit b27e567c51940289e0a989cc65f4696739d5936a
(https://codereview.chromium.org/2498623002/)

which previously landed as
087c8b21705dd47c9a71058bf743147324425585
(https://codereview.chromium.org/2474303004/)

BUG=348655
Committed: https://crrev.com/8786fd7ee3dae56e283dc50467675f668cd8c3a6
Cr-Commit-Position: refs/heads/master@{#434246}

[Charlie Harrison, 2016-11-23 02:10:56]

csharrison@chromium.org changed reviewers:
+ kinuko@chromium.org

[Charlie Harrison, 2016-11-23 02:10:57]

kinuko: shall we try this again? I asked blink-dev for advice here [1] and
decided to just move this to a helper function in an anonymous namespace that is
empty in non debug builds.

WDYT?

+tkent FYI 

[1]
https://groups.google.com/a/chromium.org/d/msg/blink-dev/uG7TCSLJB1s/2fJP7sP4...

[kinuko, 2016-11-23 10:22:51]

Yep, it's not too pretty but this makes sense too. lgtm

[Charlie Harrison, 2016-11-23 17:14:06]

Thanks!

[Charlie Harrison, 2016-11-23 17:14:12]

The CQ bit was checked by csharrison@chromium.org

[commit-bot: I haz the power, 2016-11-23 17:14:39]

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, 2016-11-23 21:04:09]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1479921252897660,
"parent_rev": "38f429c555186d002742f94d5f63c4bace8b6dd8", "commit_rev":
"bb10e3a10748faa6084b34033889ae83abd3900d"}

[commit-bot: I haz the power, 2016-11-23 21:04:38]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-23 21:07:09]

Description was changed from

==========
Reland of "Remove mutex locks in SchemeRegistry"

This reverts commit b27e567c51940289e0a989cc65f4696739d5936a
(https://codereview.chromium.org/2498623002/)

which previously landed as
087c8b21705dd47c9a71058bf743147324425585
(https://codereview.chromium.org/2474303004/)

BUG=348655
==========

to

==========
Reland of "Remove mutex locks in SchemeRegistry"

This reverts commit b27e567c51940289e0a989cc65f4696739d5936a
(https://codereview.chromium.org/2498623002/)

which previously landed as
087c8b21705dd47c9a71058bf743147324425585
(https://codereview.chromium.org/2474303004/)

BUG=348655

Committed: https://crrev.com/8786fd7ee3dae56e283dc50467675f668cd8c3a6
Cr-Commit-Position: refs/heads/master@{#434246}
==========

[commit-bot: I haz the power, 2016-11-23 21:07:10]

Patchset 2 (id:??) landed as
https://crrev.com/8786fd7ee3dae56e283dc50467675f668cd8c3a6
Cr-Commit-Position: refs/heads/master@{#434246}