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This CL teaches PlatformVideoFramePoolTest to use the parameterization
defined inside (ToT did not use it). It also removes the surprising
(unnecessary?) explicit unique_ptr deleter, using PlatformVideoFramePool
directly, and also takes the chance to remove the private ctor in that
class, since anyway the Test is a friend and can access the internal
members (albeit we lose a const).

Test: media_unittests on a target_os="chromeos" build
Bug: 1040291
Change-Id: I660e579b34a0ebea213f3c4a9b66b64a17043f3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992762
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729787}