Trusty has gnome-settings-daemon 3.8.6.  Support for XF86AudioMicMute was added 
in gnome-settings-daemon 3.9.2:
https://github.com/GNOME/gnome-settings-daemon/commit/3a8beaaf380a483ce33363031d8d276c371d7af1

I believe gnome-settings-daemon (and unity-settings-daemon) need to
backport that patch for XF86AudioMicMute support.

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https://bugs.launchpad.net/bugs/408903

Title:
  Does not handle microphone mute button (KEY_MICMUTE)

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