In `get_network_by_path()`, `$exact_domains` is unused.

See #27882.

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git-svn-id: http://core.svn.wordpress.org/trunk@28157 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `Walker_Nav_Menu::start_el()`, `$class_names` is set twice before it is used.

See #27882.

Built from https://develop.svn.wordpress.org/trunk@28330


git-svn-id: http://core.svn.wordpress.org/trunk@28158 1a063a9b-81f0-0310-95a4-ce76da25c4cd