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Remove stale fieldtrial_testing_configs.

This CL removes all studies in fieldtrial_testing_config.json where
neither the study name nor any of enabled or disabled feature names
appear as a string literal elsewhere in the codebase.

Bug: 1045530, 1053702
Change-Id: If46efd7269250a7f3d18ca2d234a72d8e08bde12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063133
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742702}