We have a managed package that comes with custom activity fields, we would like to know what our  options are to remove custom activity fields and possibly have those fields entered into a custom table. what are our options?

Our package uses a cti adapter to initiate an activity in a visual force page.
Previously (and still for IE and Firefox) the value for document.referrer included the entire url for the originating page ex
https://na46.salesforce.com/006i000000C8Hc4 for a click from an opportunity page. 
 
Currently in chrome 61 it is only returning the base url https://na46.salesforce.com
 
Is there anything from a Salesforce perspective that can be done to regain the previous behavior of the document.referrer value?
Or another way of obtaining the who/what ID of the page the cti link was clicked from?
 

We have a managed package that comes with custom activity fields, we would like to know what our  options are to remove custom activity fields and possibly have those fields entered into a custom table. what are our options?