[CodeHealth] Use base::HeapArray in video_capture_resource.cc

Replace std::unique_ptr<T[]> pattern with a base::HeapArray.

Fixed: 326458736
Change-Id: If4cfc23e0971ae4116815553efa83af6f049cba6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5621070
Commit-Queue: Maria Kazinova <kazinova@google.com>
Reviewed-by: Fabian Sommer <fabiansommer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313366}
NOKEYCHECK=True
GitOrigin-RevId: fb408e30cff17e27e5b03ee7142c0a911dc71b5b
1 file changed