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This improves the chrome://device-log UI as follows:
* Log level is a dropdown instead of separate checkboxes
* Type checkboxes are on a separate row with a 'clear' button

Bug: 1054951
Change-Id: Ie0694dfab61045d10b6d9d32b698d62a1d3950b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068877Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744729}