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Now that new ml agent is enabled by default, we can remove the old model
and ml_service_client code of smart dim.

Also change the unit test accordingly.

Bug: 1067048, 1136331
Test: Unit test passed & tested on DUT
Change-Id: Ife97ecd54d0dec0ddcd6c816517c4c71629ce0eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462989Reviewed-by: Andrew Moylan <amoylan@chromium.org>
Reviewed-by: Xinglong Luan <alanlxl@chromium.org>
Commit-Queue: Xinglong Luan <alanlxl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816439}