Add CHECKs to try to narrow down cause of bad internal fields in Window DOM wrapper

Add CHECKs to try to narrow down cause of bad internal fields in Window DOM wrapper

BUG=696528
Review-Url: https://codereview.chromium.org/2736533002
Cr-Commit-Position: refs/heads/master@{#454781}
Committed: https://chromium.googlesource.com/chromium/src/+/7cf0339964c7dcb8b77660a31bed2467b9f7cc3a

[dcheng, 2017-03-04 19:27:01]

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

[commit-bot: I haz the power, 2017-03-04 19:27:08]

Dry run: 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, 2017-03-04 21:13:06]

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

[commit-bot: I haz the power, 2017-03-04 21:13:07]

Dry run: Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[dcheng, 2017-03-04 21:26:00]

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

[commit-bot: I haz the power, 2017-03-04 21:26:05]

Dry run: 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, 2017-03-04 21:58:50]

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

[commit-bot: I haz the power, 2017-03-04 21:58:51]

Dry run: This issue passed the CQ dry run.

[jbroman, 2017-03-04 23:20:37]

jbroman@chromium.org changed reviewers:
+ jbroman@chromium.org

[jbroman, 2017-03-04 23:20:38]

lgtm

[dcheng, 2017-03-04 23:22:47]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2017-03-04 23:22:58]

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, 2017-03-04 23:32:55]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1488669767418840,
"parent_rev": "d8b7d84c49f08b6e50de6da191264401c074c5a0", "commit_rev":
"7cf0339964c7dcb8b77660a31bed2467b9f7cc3a"}

[commit-bot: I haz the power, 2017-03-04 23:33:28]

Description was changed from

==========
Add CHECKs to try to narrow down cause of bad internal fields in Window DOM
wrapper

BUG=696528
==========

to

==========
Add CHECKs to try to narrow down cause of bad internal fields in Window DOM
wrapper

BUG=696528

Review-Url: https://codereview.chromium.org/2736533002
Cr-Commit-Position: refs/heads/master@{#454781}
Committed:
https://chromium.googlesource.com/chromium/src/+/7cf0339964c7dcb8b77660a31bed...
==========

[commit-bot: I haz the power, 2017-03-04 23:33:29]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/7cf0339964c7dcb8b77660a31bed...

[haraken, 2017-03-05 02:29:40]

LGTM

[dcheng, 2017-03-06 19:41:09]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2736733003/ by dcheng@chromium.org.

The reason for reverting is: Reverting debugging patch.