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A getter is used for NetworkConnectionTracker because some services that
use ResourceRequestAllowedNotifier are initialized early in browser
startup (e.g. VariationsService), and only perform the initialization
of ResourceRequestAllowedNotifier later on the UI thread. The getter
allows us to run get the connection tracker at that point so we don't get
DCHECKs about being on the UI thread when running
content::GetNetworkConnectionTracker().

This also moves the NetworkConnectionTracker in ios/ from BrowserState to
ApplicationContext, which is available everywhere. It also matches non-IOS
usage more closely, since we have it as a global there.

Bug: 868021
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I130c6b47feb90f0f7f0776ccc65666414a1ae802
Reviewed-on: https://chromium-review.googlesource.com/1180360Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584849}