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Legacy IPC was switched to BigBuffer in https://crrev.com/4c5bd80e
and therefore no longer needs to be capped at a maximum size.

This removes a stale and unnecessary CHECK against the message size.

Bug: 904415
Change-Id: I1934b06bb0adb3e1d1c6425f906d9f32784beb9b
Reviewed-on: https://chromium-review.googlesource.com/c/1333989Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#607784}