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This DCHECK occasionally triggers, but for unknown reasons. Update the
DCHECK to exclude re-registering the same main web frame. This will
separate the issue from the same frame being re-registered which will be
caught by the next, already existing DCHECK.

Bug: 1014227
Change-Id: Ic5a248f12467812e2b6b287565aa37f675935661
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354713
Auto-Submit: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798205}