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Convert JS files for directory_model.js and dependencies.

In //ui/file_manager/file_manager/foreground/js/:
- constants.js
- directory_contents.js
- directory_contents_unittest.m.js
- directory_model.js
- file_list_model.js
- file_list_model_unittest.m.js
- file_watcher.js

In //ui/file_manager/file_manager/foreground/js/ui/:
- file_list_selection_model.js
- file_list_selection_model_unittest.m.js

In //ui/file_manager/externs/:
- entries_changed_event.js

To avoid the circular dependency where directory_contents.js depends on
directoryModel and directory_model.js depends on DirectoryContents, the
constant `DirectoryModel.CROSTINI_CONNECT_ERR` in
//u/f/f/f/j/directory_model.js has been moved to
`constants.CROSTINI_CONNECT_ERR` in //u/f/f/f/j/constants.js.

Remove `DriveMetadataSearchContentScanner.SearchType`, which is a copy
of chrome.fileManagerPrivate.SearchType. This makes mocking easier in
directory_contents_unittest.m.js.

Bug: 1133186
Change-Id: I819da19a9f9c0ab380e4c35c7d6ca3672b2b3556
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2610413
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840482}