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Incognito dynamic quota has been enabled by default. The feature and
experimental test code are cleaned up.

Bug: 1017120
Change-Id: I18895ae16dbd2641cf67d8f113b56509da67c7fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426570Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Auto-Submit: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813936}