Revert of Add CHECKs to try to narrow down cause of bad internal fields in Window DOM wrapper (patchset #2 id:20001 of https://codereview.chromium.org/2736533002/ )

Reason for revert:
Reverting debugging patch

Original issue's description:
> 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

TBR=jbroman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=696528

Review-Url: https://codereview.chromium.org/2736733003
Cr-Commit-Position: refs/heads/master@{#454967}
2 files changed