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This CL also changes InstallationNotifier class to be compatible
with OCMock (UIApplication shared instance is not stored in ivar anymore)
and adds resetDispatcher method to allow restoring InstallationNotifier
to its default state.

Bug: 791806
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Iaee0d80938639d23862b254732eb49c97ddd4e86
Reviewed-on: https://chromium-review.googlesource.com/958123
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543515}