[wp-trac] [WordPress Trac] #37035: Move Walker_Nav_Menu class into its own file

[WordPress Trac]

#37035: Move Walker_Nav_Menu class into its own file
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 Reporter:  ocean90      |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  4.6
Component:  Menus        |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 `Walker_Nav_Menu` is the only subclass of `Walker` which is not in its own
 file. Let's change that.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37035>
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