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CL:1947603 noted how to remove the .dialog-navigation-list dependency
from the directory tree _and_ keep its unittest passing.

Thus this CL. There are no integration tests of the FilesApp splitter
or FilesApp window resize event handling. Add tests for both, and use
them to test the tree "clipped" attribute, since it is active in both
files-ng and normal FilesApp after this change.

Bug: 992819
Change-Id: Id46cbee77fc39bb227f66fc2850ee09a6fe68df8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947620Reviewed-by: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721907}