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During re-init, we sometimes don't have a codec.  This causes a
dcheck if we also decide to re-init the codec to increase the
input buffer size.

If there really is no codec when we re-init (e.g., if we're already
in the middle of a reallocation from a previous re-init), then we'll
just re-re-init the codec and continue.  So, just omit the DCHECK.

Bug: 1048341
Change-Id: I199c4ccdce1c169be069ab96593188de76250648
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036277Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742260}