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The CL to fix HDR color banding issues (https://crrev.com/c/2411731)
introduced a bug by holding on to the last swap chain which asked for
the video processor in DCLayerTree. This CL attempts to fix that in the
least impactful way so that it can be safely merged to M87.

Bug: 1126365
Change-Id: I2cbae929738598782b59e5d3390fcc4dddfc5673
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444189
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814483}