#2005166: Create simple file listing under admin/content/file added two views:
admin/content/files for an overview
admin/content/files/usage/% for a single file's usage info
These were added as two separate views, but they should have been a single view with two displays.
While rebuilding this, I noticed the breadcrumbs were broken for the file usage view.
I found that fix, which can be split out if needed.