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about:srcdoc document is always loaded inside an iframe and is
same-SiteInstance with its parent.

This is checked in CommitNavigation.

As a precautionary measure, this initially landed as a
DumpWithoutCrashing() to avoid hurting canary/dev/beta users if those
check were violated. It was planned to remove the DumpWithoutCrashing
for M79 if there was no reported DumpWithoutCrashing.

There are none of them:
https://crash.corp.google.com/browse?q=product_name%3D%22Chrome%22+AND+STRPOS%28expanded_custom_data.ChromeCrashProto.magic_signature_1.name%2C+%27CommitNavigation%27%29+%3E+0+AND+expanded_custom_data.ChromeCrashProto.magic_signature_1.name%3D%27content%3A%3ARenderFrameHostImpl%3A%3ACommitNavigation%27+AND+product.Version%3E%3D%2778.0.3904.63%27&stbtiq=&reportid=70db5bbe497238ba&index=9#4

Bug: None
Change-Id: Iee51ddcb31fd3a7b1b7155c02f726e24c160f31c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913401
Auto-Submit: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715115}