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Expands on the shared initialization to include base::AtExitManager,
net::NetworkChangeNotifier, and base::MessageLoopForUI.

With this change Cronet and ChromeWebView can successfully be used when
built together in the framework created by
//ios/web_view:cronet_web_view_combined.

Bug: 738510
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester
Change-Id: Iead4ba5d4f2376b09edf3f5c87a13829229b83b4
Reviewed-on: https://chromium-review.googlesource.com/558268
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487161}