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If you quit the app in iOS multitasking, it DCHECKs in a few places. This makes it impossible to
write integration tests.

This happens because, in our current setup, ObjC classes stay around longer than C++ classes.
More specifically, CWVWebViewConfiguration stays around longer than WebViewWebMainParts.
Since any client may retain CWVWebViewConfiguration for any reason, we cannot rely on dealloc to
clean things up. Instead, a |shutDown| method is used to tear things down in the proper order.

Bug: 733452
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I5c7b3e2f5fc81ee9d67e3a8a499301e4c814726e
Reviewed-on: https://chromium-review.googlesource.com/825444
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523991}