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This cl cleans up logged messages that were intended for
model debugging. Now that the model is launched, we
can remove these messages and reduce spamming to the
logs.

Bug: 1148161
Change-Id: Iad9d202dde77ee5ca5662f6ac77494ea7e958ff3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535894Reviewed-by: Thanh Nguyen <thanhdng@chromium.org>
Commit-Queue: Jia Meng <jiameng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827118}