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When the resolution changes, we recreate the image processor device
entirely. However we used to do so while reusing the same V4L2Device
instance, which is not supported and triggers a DCHECK() with Debug
builds.

This behavior is wrong anyway since we might want to use another image
processor device with the new resolution.

This also seems to be effective in fixing bug 1029396.

BUG=chromium:1029396
TEST=video.DecodeAccel.h264_resolution_switch passes 100 times in a row
on Hana.
TEST=video.DecodeAccel.h264_resolution_switch passes on Hana without
triggering DCHECK().

Change-Id: Ib506d9f038810a0683b806f8385746dce16ecd56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002250
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732259}