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https://crrev.com/c/2426086 introduced a pointless DCHECK and also had a
comment on ShouldCreateNewHostForCrashedFrame that was left over from
the approach of skipping early commit on all non-live frames.

Bug: 1072817
Change-Id: I2a8c4ad6147a6941baf6d3fdd7358a80c74e41fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469346Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820683}