SDK / exoplayer

- I think \r and \n are handled the wrong way around?
- We only expect to encounter a BOM sequence at the start of a
  file, but it feels fine to automatically discard it in all
  cases for simplicity. A BOM sequence doesn't mean anything in
  UTF-8. See https://en.wikipedia.org/wiki/Byte_order_mark. Note
  that I think the advice not to remove it on that page relates
  only to the case where the file is being edited + saved.

Issue #1136
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=112143407