Remove VideoProcessorIntegrationTest::SetTestConfig. BUG=webrtc:6634 Review-Url: https://codereview.webrtc.org/3004983002 Cr-Original-Commit-Position: refs/heads/master@{#19648} Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc Cr-Mirrored-Commit: ffbe1cd07ef1b20a59415a0d440e8684505a2902