GitLab

Fix typo in TryToSetupDecodeOnSeparateThread method to set
decode_client_ properly in V4L2VideoDecodeAccelerator and
V4L2SliceVideoDecodeAccelerator classes.

BUG=

Review-Url: https://codereview.chromium.org/2044033002
Cr-Commit-Position: refs/heads/master@{#398268}