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Files app has migrated to file_handlers, so allowing it to use
file_browser_handlers is no longer necessary.

Bug: 933674
Change-Id: Ifffadba9c7444516ebd759ecc5fa9246bbd620f8
Reviewed-on: https://chromium-review.googlesource.com/c/1496117
Auto-Submit: Sam McNally <sammc@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636722}