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Also modifies DecodeBcd() to handle invalid inputs (and removes DCHECKs),
since the inputs may come from an untrusted USB device.

Change-Id: I387ec1fe51b6916fe7c097123936991d67f228aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033850
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Auto-Submit: Dan McArdle <dmcardle@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738582}