libevdev: Downgrade Event_Sync_State warning to debug. Use LOG_DEBUG rather than LOG_WARNING for an informative message that spams Chrome's log at startup: Event_Sync_State: before 39.191955 after 39.191960 BUG=none TEST=none Change-Id: I0ae31e0c5630ba2da012d24c070c659141ee5013 Reviewed-on: https://chromium-review.googlesource.com/386676 Commit-Ready: Dan Erat <[email protected]> Tested-by: Dan Erat <[email protected]> Reviewed-by: Charlie Mooney <[email protected]>