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[Files app] Convert directory_tree.js to ES6 class

Converted with lebab:
$ lebab --replace tree.js  --transform class

Then manually:

1. Move @extends {cr.ui.TreeItem} to actual ES6 extends.
2. call super() in the ctor.
3. Move Closure markup from class to its ctor.
4. Remove return from ctor.
5. Rename item.* to this.* in ctor.
6. Check FunctionName.prototype = { __proto__: ... } move getters/
setters to class body, removing trailing commas.
7. Fix closure errors, mostly declaring attributes in the ctor.
8. Run clang format in the file, because lebab format style is very
different.

$ buildtools/linux64/clang-format -i \
   ui/file_manager/file_manager/foreground/js/ui/directory_tree.js

Test: No change in behavior, so current tests already covers it.
Bug: 778674
Change-Id: I2f11ea6d85ef9546fc3b54e5b0a5e187e8b3e90b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539479
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644689}