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Servicify Network Quality Estimator (NQE) in content. This CL
replaces NQE APIs by Network Quality Tracker (NQT). The
latter works with network servicification enabled as well.

The NQE/NQT APIs in content are used to send network quality change
notifications to the renderer process. These are eventually
consumed by Blink as well as exposed to Web via NetInfo.

This CL also adds a Chrome browser test for the NetInfo API.

Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: Ib8c0f9b1742d3c1eb3dbefe8d891c06c4e986492
Bug: 883010
Reviewed-on: https://chromium-review.googlesource.com/1214603Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593051}