remove On Impression Listener
Unregisters a previously added OnImpressionListener.
After this call, the specified listener will no longer receive impression events. If the given listener was not previously registered, this method has no effect. Use the same listener instance that was passed to addOnImpressionListener.
Parameters
listener
The non-null OnImpressionListener instance to unregister.
See also
Throws
if listener
is null.