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This brings the (still hand-written) externs/file_manager_private.js
file closer to what tools/json_schema_compiler/compiler.py generates.

Test: "ninja ui/file_manager:closure_compile" runs without error
Bug: 613096
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ib3dfdddd9a6b9c0d67d143f89a5f9348eaecb4ae
Reviewed-on: https://chromium-review.googlesource.com/1088345Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565095}