GitLab

 - remove device_handler_unittest.html
 - add BUILD rule to auto-generate this unit test
 - add BUILD rule to Closure compile this unit test
 - rename handler -> deviceHander, use mockChrome
   everywhere and also install it during Setup()
 - remove unused timeoutCallbacks var
 - fix Closure errors, js code auto-format

No change in test behavior, no new tests.

Bug: 908673
No-try: true
Change-Id: I46535df1c77a57c488e40f9c410ca4a62ad73ac5
Reviewed-on: https://chromium-review.googlesource.com/c/1351336
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611000}