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This CL makes the host uninstaller delete the settings file.

Change-Id: If03663338817dba6b15f15ae4493e6edfce9290d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640652
Auto-Submit: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845769}