GitLab

 - remove file_operation_manager_unittest.html
 - add BUILD rules to auto-generate and compile this unittest
 - define mockChrome and install it in unittest Setup()
 - fix Closure compile errors

No change in test behavior, no new tests.

Bug: 907967
Change-Id: I523218dd179c5e9b0ae55b81d4a5480eea279f8c
Reviewed-on: https://chromium-review.googlesource.com/c/1352115Reviewed-by: Stuart Langley <slangley@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611501}