removeEventHandler()
Signature
removeEventHandler(String event, function handler, String phase)
Parameters
event: Type: String. The name of the event to remove; for example, 'c:myEvent'.
handler: Type: function. A reference to the function or action to remove; for example., 'cmp.getReference("c.handleMyEvent");'.
phase: Type: String. Optional. The event bubbling phase for which to remove the handler. The default value is "default".