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by QUIC users. Those notifications are:
- NetworkConnected
- NetworkMadeDefault
- NetworkDisconnected
- NetworkSoonToDisconnect
- IpAddressChanged

Bug: 765436
Change-Id: I6205540d9dbbff63010a40ef06febfede2257bef
Reviewed-on: https://chromium-review.googlesource.com/687878Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504835}