Asynchronously get the list of #WebKitITPThirdParty seen for @manager. Every #WebKitITPThirdParty
contains the list of #WebKitITPFirstParty under which it has been seen.
When the operation is finished, @callback will be called. You can then call
webkit_website_data_manager_get_itp_summary_finish() to get the result of the operation.
Asynchronously get the list of #WebKitITPThirdParty seen for @manager. Every #WebKitITPThirdParty contains the list of #WebKitITPFirstParty under which it has been seen.
When the operation is finished, @callback will be called. You can then call webkit_website_data_manager_get_itp_summary_finish() to get the result of the operation.