[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:               |   Keywords:
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 Yahoo! discontinued some functionality in Dec 2012 and Jan 2013. We should
 remove our code related tot his functionality.

 The two big things are public chat rooms (but not private chat rooms, I
 think), and interoperability with MSN.

 Details here:
 http://yahoomessenger.tumblr.com/post/53310509425/change-is-in-the-air-
 updates-to-yahoo-messenger

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