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The current watchdog V2 has the same timeout value as V1. All experiment
code in V2 is removed.

Bug: 949839
Change-Id: I5f85d2ee538833234e328bbe2b98c2891e305a22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083755Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747453}