Restart DnsConfig watcher on DnsConfigServicePosix::StartWatching.

Bug: 987699

Change-Id: I31cd9181690e215ae8fa48d19901b0a5fa28cae1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717441
Auto-Submit: Zhongyi Shi <zhongyi@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681053}
1 file changed