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When a resolution change event occurred, we would have parsed the
curr_frame_hdr_, but then this would cause us to skip extracting the
DecryptConfig for the current frame. This retains the DecryptConfig so
it can be used when that frame is decoded.

BUG=b:155509231
TEST=Encrypted VP9 plays back on volteer w/out corruption

Change-Id: Ie005d2bcea0677342e262a96eb3b97d919cbf9a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622750
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842177}