GitLab

 - remove actions_model_unittest.html
 - add BUILD rules to auto-generate and compile this unittest
 - make mock_drive_sync_handler visible to foreground unittests
 - Add Closure @type defines to unittest variables (OMG).
 - fix Closure compile errors

Bug: 911005
Change-Id: Ia29ca0e11ee984f00daf66271ff65e5fcb52b1c7
Reviewed-on: https://chromium-review.googlesource.com/c/1356732
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613024}