[Pidgin] #15907: Remove discontinued Yahoo! functionality

[Pidgin]

#15907: Remove discontinued Yahoo! functionality
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 Reporter:  MarkDoliner  |       Owner:  EionRobb
     Type:  task         |      Status:  new
Milestone:  3.0.0        |   Component:  unclassified
  Version:               |  Resolution:
 Keywords:               |
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Comment (by mmcco):

 This could potentially be merged with #15906, which discusses removing the
 discontinued Yahoo! Japan. I'm working on that now and can look into
 public chat rooms and MSN interoperability afterward. If anyone knows of
 any other discontinued features, please share.

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Ticket URL: <https://developer.pidgin.im/ticket/15907#comment:2>
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