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The VideoSampleEntry box includes a scoped_refptr<BitstreamConverter>
regardless always, but we were only building the BitstreamConverter cc/h
files when proprietary_codecs=true. This CL includes the
BitstreamConverter interface defintion in all builds.

Proprietary bitsream conversion logic (e.g. AVCBitstreamConvter) is
still only included if proprietary_codecs = true.

BUG: 793702
Change-Id: I8720b6547ca2e0af47d64ae594e86850da0e84b5
Reviewed-on: https://chromium-review.googlesource.com/819978
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523242}