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HLS manifests can request segments from a different origin than the
original manifest's origin. We do not inspect HLS manifests within
Chromium, and instead delegate to Android's MediaPlayer. This means we
need to be conservative, and always assume segments might come from a
different origin. HasSingleSecurityOrigin should always return false
when decoding HLS.

Bug: 864283
Change-Id: Ie16849ac6f29ae7eaa9caf342ad0509a226228ef
Reviewed-on: https://chromium-review.googlesource.com/1142691Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576378}