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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.

This CL has been generated semi-automatically:
1. Download cleanup.py attached to https://crbug.com/1053702#c3
2. Generate cleaned-up list of studies:
   $ python3 ~/Downloads/cleanup.py \
         testing/variations/fieldtrial_testing_config.json \
         ~/scratch/out.txt
3. Copy the output:
   $ cp ~/scratch/out.txt \
         testing/variations/fieldtrial_testing_config.json
4. Format the output:
   $ python testing/variations/PRESUBMIT.py \
         testing/variations/fieldtrial_testing_config.json

Bug: 1053702
Change-Id: I100d97a68aabeba2f7c182cc9ddc478314d71dde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379730
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803456}