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This change has two main effects. First, this allows for the
CoreOobeHandler to decide whether or not the powerwash dialog should be
shown (e.g. due to being enterprise enrolled). Second, this seems to fix
the race between the Gaia screen init and the powerwash dialog when the
user hits CTRL+ALT+SHIFT+R early on.

This CL also adds a unit test to ensure that the powerwash shortcut
sends a mojo call to the browser thread.

Bug: 837501
Change-Id: I345e4c4f5be7ecb64b6d7605101e93feb2fc3bbf
Reviewed-on: https://chromium-review.googlesource.com/1148646Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Quan Nguyen <qnnguyen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577998}