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Generate JS modules for:
//ui/file_manager/externs/background/import_history.js
//ui/file_manager/file_manager/background/js/import_history.js
//ui/file_manager/file_manager/background/js/test_import_history.js

Because Closure doesn't deal well importing the same namespace from
different files, I started splitting the "importer" namespace so each
file will have its own namespace.  Files in the "externs" directory will
have the suffix "Interface" on their namespace.  I'll use this logic for
all files related to "importer" namespace.

Bug: 1133186
Change-Id: Iec2851ea28cdf8b4b079a997e74d99b2dfbf92f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592854
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837934}