Revert "media: CHECK DecryptingVideoDecoder::Reset() assumptions"

This reverts commit 49a34447e6fadf4541d8ea937ff86a4db1b06618.

The investigation is over and we don't need this anymore.

BUG=695554

Review-Url: https://codereview.chromium.org/2775983002
Cr-Commit-Position: refs/heads/master@{#460830}
1 file changed