Revert of Remove mutex locks in SchemeRegistry

Revert of Remove mutex locks in SchemeRegistry (patchset #5 id:80001 of https://codereview.chromium.org/2474303004/ )

Reason for revert:
Causing build issues
https://build.chromium.org/p/chromium.fyi/builders/Chromium%20Win%20PGO%20Builder/builds/5481

Original issue's description:
> Remove mutex locks in SchemeRegistry
>
> This patch removes locks from the SchemeRegistry, in favor of moving all
> initialization to the render thread initialization period.
>
> BUG=348655
>
> Committed: https://crrev.com/087c8b21705dd47c9a71058bf743147324425585
> Cr-Commit-Position: refs/heads/master@{#431468}

TBR=tkent@chromium.org,kinuko@chromium.org,sebmarchand@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=348655
Committed: https://crrev.com/b27e567c51940289e0a989cc65f4696739d5936a
Cr-Commit-Position: refs/heads/master@{#431654}

[Charlie Harrison, 2016-11-11 14:13:02]

The CQ bit was checked by csharrison@chromium.org

[Charlie Harrison, 2016-11-11 14:13:03]

Created Revert of Remove mutex locks in SchemeRegistry

[commit-bot: I haz the power, 2016-11-11 14:13:12]

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, 2016-11-11 16:56:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-11 16:56:05]

Try jobs failed on following builders:
  win_chromium_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[Charlie Harrison, 2016-11-11 17:54:29]

The CQ bit was checked by csharrison@chromium.org

[commit-bot: I haz the power, 2016-11-11 17:54:51]

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, 2016-11-11 21:42:05]

Description was changed from

==========
Revert of Remove mutex locks in SchemeRegistry (patchset #5 id:80001 of
https://codereview.chromium.org/2474303004/ )

Reason for revert:
Causing build issues 
https://build.chromium.org/p/chromium.fyi/builders/Chromium%20Win%20PGO%20Bui...

Original issue's description:
> Remove mutex locks in SchemeRegistry
> 
> This patch removes locks from the SchemeRegistry, in favor of moving all
> initialization to the render thread initialization period.
> 
> BUG=348655
> 
> Committed: https://crrev.com/087c8b21705dd47c9a71058bf743147324425585
> Cr-Commit-Position: refs/heads/master@{#431468}

TBR=tkent@chromium.org,kinuko@chromium.org,sebmarchand@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=348655
==========

to

==========
Revert of Remove mutex locks in SchemeRegistry (patchset #5 id:80001 of
https://codereview.chromium.org/2474303004/ )

Reason for revert:
Causing build issues 
https://build.chromium.org/p/chromium.fyi/builders/Chromium%20Win%20PGO%20Bui...

Original issue's description:
> Remove mutex locks in SchemeRegistry
> 
> This patch removes locks from the SchemeRegistry, in favor of moving all
> initialization to the render thread initialization period.
> 
> BUG=348655
> 
> Committed: https://crrev.com/087c8b21705dd47c9a71058bf743147324425585
> Cr-Commit-Position: refs/heads/master@{#431468}

TBR=tkent@chromium.org,kinuko@chromium.org,sebmarchand@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=348655
==========

[commit-bot: I haz the power, 2016-11-11 21:42:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-11 21:47:32]

Description was changed from

==========
Revert of Remove mutex locks in SchemeRegistry (patchset #5 id:80001 of
https://codereview.chromium.org/2474303004/ )

Reason for revert:
Causing build issues 
https://build.chromium.org/p/chromium.fyi/builders/Chromium%20Win%20PGO%20Bui...

Original issue's description:
> Remove mutex locks in SchemeRegistry
> 
> This patch removes locks from the SchemeRegistry, in favor of moving all
> initialization to the render thread initialization period.
> 
> BUG=348655
> 
> Committed: https://crrev.com/087c8b21705dd47c9a71058bf743147324425585
> Cr-Commit-Position: refs/heads/master@{#431468}

TBR=tkent@chromium.org,kinuko@chromium.org,sebmarchand@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=348655
==========

to

==========
Revert of Remove mutex locks in SchemeRegistry (patchset #5 id:80001 of
https://codereview.chromium.org/2474303004/ )

Reason for revert:
Causing build issues
https://build.chromium.org/p/chromium.fyi/builders/Chromium%20Win%20PGO%20Bui...

Original issue's description:
> Remove mutex locks in SchemeRegistry
>
> This patch removes locks from the SchemeRegistry, in favor of moving all
> initialization to the render thread initialization period.
>
> BUG=348655
>
> Committed: https://crrev.com/087c8b21705dd47c9a71058bf743147324425585
> Cr-Commit-Position: refs/heads/master@{#431468}

TBR=tkent@chromium.org,kinuko@chromium.org,sebmarchand@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=348655

Committed: https://crrev.com/b27e567c51940289e0a989cc65f4696739d5936a
Cr-Commit-Position: refs/heads/master@{#431654}
==========

[commit-bot: I haz the power, 2016-11-11 21:47:32]

Patchset 1 (id:??) landed as
https://crrev.com/b27e567c51940289e0a989cc65f4696739d5936a
Cr-Commit-Position: refs/heads/master@{#431654}

[tkent, 2016-11-14 01:40:00]

lgtm