Revert of Un-DCHECK-guard ThreadRestrictionVerifier for strings.

Revert of Un-DCHECK-guard ThreadRestrictionVerifier for strings. (patchset #2 id:20001 of https://codereview.chromium.org/2743663003/ )

Reason for revert:
Reverting as I finish up my investigation.

BUG=701361
Original issue's description:
> Un-DCHECK-guard ThreadRestrictionVerifier for strings.
> 
> This should help us debug various String crashes we've been seeing
> through the crash server, particularly the linked bug.
> 
> Note that this will definitely make strings slow on Canary, and will
> possibly cause crashes other than the particular one I was looking
> for. These crashes will all be security bugs though, so we should
> get some valuable information regardless.
> 
> PSA to blink-dev that I am doing this investigation is here: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/SupcNcaTh_g
> 
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> 
> BUG=694520
> 
> Review-Url: https://codereview.chromium.org/2743663003
> Cr-Commit-Position: refs/heads/master@{#456323}
> Committed: https://chromium.googlesource.com/chromium/src/+/3a001533b29c0fe28f2354285b2c2ac8d57d8ce6

TBR=esprehn@chromium.org,csharrison@chromium.org,sigbjornf@opera.com,wez@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=694520
Review-Url: https://codereview.chromium.org/2753953002
Cr-Commit-Position: refs/heads/master@{#457672}
Committed: https://chromium.googlesource.com/chromium/src/+/32c86f9955aa028ea55a4538c61c67e0dbf6294e

[meade_UTC10, 2017-03-15 22:22:51]

Created Revert of Un-DCHECK-guard ThreadRestrictionVerifier for strings.

[Charlie Harrison, 2017-03-15 22:25:30]

LGTM

[meade_UTC10, 2017-03-16 05:51:07]

The CQ bit was checked by meade@chromium.org

[commit-bot: I haz the power, 2017-03-16 05:51:22]

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, 2017-03-16 06:30:36]

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

[commit-bot: I haz the power, 2017-03-16 06:30:38]

Try jobs failed on following builders:
  cast_shell_linux on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/cast_shell_linu...)

[meade_UTC10, 2017-03-16 07:15:37]

The CQ bit was checked by meade@chromium.org

[commit-bot: I haz the power, 2017-03-16 07:15:47]

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, 2017-03-16 07:32:53]

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

[commit-bot: I haz the power, 2017-03-16 07:32:54]

Try jobs failed on following builders:
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[meade_UTC10, 2017-03-17 00:25:29]

The CQ bit was checked by meade@chromium.org

[commit-bot: I haz the power, 2017-03-17 00:26:14]

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, 2017-03-17 03:29:26]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489710329357120, "parent_rev":
"15ab4383c9edfdaff28aae9084b5f46dd4ab4fba", "commit_rev":
"32c86f9955aa028ea55a4538c61c67e0dbf6294e"}

[commit-bot: I haz the power, 2017-03-17 03:31:14]

Description was changed from

==========
Revert of Un-DCHECK-guard ThreadRestrictionVerifier for strings. (patchset #2
id:20001 of https://codereview.chromium.org/2743663003/ )

Reason for revert:
Reverting as I finish up my investigation.

BUG=701361

Original issue's description:
> Un-DCHECK-guard ThreadRestrictionVerifier for strings.
> 
> This should help us debug various String crashes we've been seeing
> through the crash server, particularly the linked bug.
> 
> Note that this will definitely make strings slow on Canary, and will
> possibly cause crashes other than the particular one I was looking
> for. These crashes will all be security bugs though, so we should
> get some valuable information regardless.
> 
> PSA to blink-dev that I am doing this investigation is here:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/SupcNcaTh_g
> 
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> 
> BUG=694520
> 
> Review-Url: https://codereview.chromium.org/2743663003
> Cr-Commit-Position: refs/heads/master@{#456323}
> Committed:
https://chromium.googlesource.com/chromium/src/+/3a001533b29c0fe28f2354285b2c...

TBR=esprehn@chromium.org,csharrison@chromium.org,sigbjornf@opera.com,wez@chro...
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=694520
==========

to

==========
Revert of Un-DCHECK-guard ThreadRestrictionVerifier for strings. (patchset #2
id:20001 of https://codereview.chromium.org/2743663003/ )

Reason for revert:
Reverting as I finish up my investigation.

BUG=701361

Original issue's description:
> Un-DCHECK-guard ThreadRestrictionVerifier for strings.
> 
> This should help us debug various String crashes we've been seeing
> through the crash server, particularly the linked bug.
> 
> Note that this will definitely make strings slow on Canary, and will
> possibly cause crashes other than the particular one I was looking
> for. These crashes will all be security bugs though, so we should
> get some valuable information regardless.
> 
> PSA to blink-dev that I am doing this investigation is here:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/SupcNcaTh_g
> 
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> This CL should be reverted by 17 March 2017.
> 
> BUG=694520
> 
> Review-Url: https://codereview.chromium.org/2743663003
> Cr-Commit-Position: refs/heads/master@{#456323}
> Committed:
https://chromium.googlesource.com/chromium/src/+/3a001533b29c0fe28f2354285b2c...

TBR=esprehn@chromium.org,csharrison@chromium.org,sigbjornf@opera.com,wez@chro...
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=694520

Review-Url: https://codereview.chromium.org/2753953002
Cr-Commit-Position: refs/heads/master@{#457672}
Committed:
https://chromium.googlesource.com/chromium/src/+/32c86f9955aa028ea55a4538c61c...
==========

[commit-bot: I haz the power, 2017-03-17 03:31:15]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/32c86f9955aa028ea55a4538c61c...