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If NSApp is used prior to instantiation of the NSApplication subclass, then the
subclass will never be instantiated.

This CL adds a CHECK to confirm that the subclass is correctly instantiated.

This CL found several tests which were unnecessarily instantiating a UI Message
Loop early in the lifetime gtest subclass, which ends up calling NSApp prior to
NSApplication subclass instantiation.

Change-Id: I8868d253b6ec6eff4f8ecdda3176d839aa1826a5
Reviewed-on: https://chromium-review.googlesource.com/1246861Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594436}