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Desktop Chrome specifies the DecryptConfig with each DecoderBuffer,
so having the pattern change is handled properly. Disabling the error
check as it is only needed for Android/Chromecast.

BUG=813845,877265
TEST=manual playback of faulty video

Change-Id: I8815906388003dec66ef113148b33801034bb02f
Reviewed-on: https://chromium-review.googlesource.com/1187713Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586808}