Revert "Make NetworkConnectionTracker survive network service crashes and restarts"

This reverts commit cec0800c372ef670f59999fb3f028013d36b866c.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified this CL at revision 574314 as the culprit
for introducing flakiness in the tests as shown on:
https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vY2VjMDgwMGMzNzJlZjY3MGY1OTk5OWZiM2YwMjgwMTNkMzZiODY2Yww

TBR=xunjieli@chromium.org

Bug: 862883

Original change's description:
> Make NetworkConnectionTracker survive network service crashes and restarts
> 
> This CL is to mirror tbansal@'s CL
> (https://chromium-review.googlesource.com/1058528) to make
> NetworkConnectionTracker survice network service's crashes and restarts.
> 
> Bug: 821009
> Change-Id: Iec33797c0fd0ce12a8e5fdab9fda0a710eb9a528
> Reviewed-on: https://chromium-review.googlesource.com/1120738
> Commit-Queue: Helen Li <xunjieli@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#574314}

TBR=jam@chromium.org,xunjieli@chromium.org,tbansal@chromium.org

Change-Id: I2524f0e04441097e06585f4f2e4cdb948a419641
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 821009
Reviewed-on: https://chromium-review.googlesource.com/1135006
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574523}
6 files changed