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Creates FindInPageManagerTest to test FindInPageManager and FindInPageManagerDelegate.

Bug: 919685
Change-Id: Ia9b680582677f984dd9b775155f8f21b0285b768
Reviewed-on: https://chromium-review.googlesource.com/c/1448912
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634434}