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Instead of stripping the codec string and table look-up by stripped codec
string, use MimeUtil ParseAudioCodecString() and ParseVideoCodecString() to
convert the codec string to media AudioCodec/VideoCodec, then have dedicated
functions to convert media codecs to EmeCodecs.

Bug: 707127
Test: All existing tests pass.
Change-Id: I9a69a76bd8acc6ef7cb23ef6630c258df3f5347f
Reviewed-on: https://chromium-review.googlesource.com/c/1277613
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600033}