Make video denoiser tests standalone, not using the VideoProcessingTest fixture.
Make video denoiser tests standalone, not using the VideoProcessingTest fixture.

BUG=None

Review-Url: https://codereview.webrtc.org/2464073002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#14890}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 0dbcfa51a27dc3efa936c2facc49e9fe9c066531

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