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Whether the button is shown depends on sites.length but the dependecy
was not declared, so the button didn't show up.
Also hide the button when there is a filter as the filter can't be
applied to third-party cookie deletion yet.

Bug: 987177
Change-Id: Id36a286ed73da404446c8b98dabbf3751b5658e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831874
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701961}