Article written about why Audience Manager appears to be in use while using the debugger tool.

We are not using AAM but we are seeing code in the debugger. Why?

It is likely you are running the Visitor ID service on your property. If you are, having this AAM reference does not necessarily refer to the property running Audience Manager but it means that Audience Manager is in fact powering this service. 

Please note that the AAM call is usually made to sync Set customer IDs.