The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8bd2c109f0cfefdf622903d4e264ed45890fa92e

commit 8bd2c109f0cfefdf622903d4e264ed45890fa92e
Author: Naoki Fukino <fukino@chromium.org>
Date: Fri Oct 13 07:34:42 2017

Files app: Remove unused selectors about tree items.

In https://chromiumcodereview.appspot.com/12857002, we replaced <list> with
<tree> element for the directory tree.
Now that tree items in <tree> do not have 'anchor' or 'lead' attribute, we can
remove selectors for them.

Bug:  773974 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I95e0aefb084477fd56c8d04ddf3fa3c32b6236f5
Reviewed-on: https://chromium-review.googlesource.com/714940
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508638}
[modify] https://crrev.com/8bd2c109f0cfefdf622903d4e264ed45890fa92e/ui/file_manager/file_manager/foreground/css/file_manager.css

Will close in favour of individual bugs as needs be.