The original clear lead integration tests weren't following the flow of
the original bug because there was only one sample, so
DecryptMultipleSamples wasn't being called in the same way. This should
fix this.
Bug: 320785945
Merged from https://widevine-internal-review.googlesource.com/198137
(cherry picked from commit 4141e271d44c32da88dc0f02a0173fae0b45ead9)
Change-Id: Ia70e3fd78381d8d34261b95931fdb303f77f73fd