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Change the SealCredentialId(), EncodeRpId(), EncodeRpIdAndUserId() and
SealLegacyV0CredentialIdForTestingOnly() methods to not return base::Optional
in order to make them less clunky. No functional changes intended.

Change-Id: Ic7088e3e016c09b1df5e4bcdc665d72c5ea3286b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1963861Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#727456}