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Moving interfaces definitions in files_app_entry_types.js to
ui/file_manager/externs/files_app_entry_interfaces.js.

This is part of the preparation for the migration of Files app JS code
to JS modules.  Due to Closure compiler limitations with externs and
JS Modules we'll generate modules for some externs files and use as
modules instead of externs.

This fixes a circular dependency where the implementations in
files_app_entry_types.js depend on volume_info.js which depends on these
extracted interfaces.

BUG=chromium:1133186, b/172300267

Change-Id: If2643c1bc50732c847d0dc99ae19bc4918c5be3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517186Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823904}