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This reverts commit 631cf612.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 665876 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzYzMWNmNjEyZTg4YmUzZWIyMWQ0MmY2ZTFjYzYxZjk3NDlmYWY3OGUM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.memory/Mac%20ASan%2064%20Tests%20%281%29/53748

Sample Failed Step: content_browsertests

Original change's description:
> Test: MHTML document loaded inside a data-URL parent.
> 
> In an MHTML document, blink::DocumentLoader::archive_ is transmitted
> from parent to children. data-URL aren't loaded from the MHTML archive.
> In this case, does it means children of data-URL aren't able to be
> loaded from the MHTML archive? Hopefully, it is currently working. They
> are able to load from the MHTML document, because |archive_| continue to
> be transmitted.
> 
> This CL adds a test to ensure this continue to work in the future.
> 
> Bug: None.
> Change-Id: Icb51dc48691112cf9e45dfe8cb81d389544a0c41
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635669
> Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#665876}


Change-Id: Iab5a838b789e845537a3a81a8f87cd54516b1162
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: None.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643089
Cr-Commit-Position: refs/heads/master@{#665896}