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Software video decoders were disabled in the default context used in
cast_runner, but not in the isolated context. It should be disabled
for all context instances used in cast.

Bug: 1035226
Change-Id: I5c17196e590a07b4e9557f353912786fcd04c9b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1971052
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726521}