ref: remove unused add_notification_referrer_param

introduced in 89742db but never called

src/sentry/plugins/bases/notify.py

@@ -1,6 +1,5 @@
 import logging
 from urllib.error import HTTPError as UrllibHTTPError
-from urllib.parse import parse_qs, urlencode, urlparse, urlunparse
 
 from django import forms
 from requests.exceptions import HTTPError, SSLError
@@ -186,15 +185,3 @@ def test_configuration_and_get_test_results(self, project):
         else:
             test_results = "No errors returned"
         return test_results
-
-    def add_notification_referrer_param(self, url):
-        if self.slug:
-            parsed_url = urlparse(url)
-            query = parse_qs(parsed_url.query)
-            query["referrer"] = self.slug
-
-            url_list = list(parsed_url)
-            url_list[4] = urlencode(query, doseq=True)
-            return urlunparse(url_list)
-
-        return url

tests/sentry/plugins/bases/test_notify.py

@@ -1,5 +1,4 @@
 from unittest import mock
-from urllib.parse import parse_qs, urlparse
 
 from requests.exceptions import HTTPError, SSLError
 
@@ -20,27 +19,6 @@ def is_configured(self, project) -> bool:
 
 
 class NotifyPluginTest(TestCase):
-    def test_add_notification_referrer_param(self):
-        n = DummyNotificationPlugin()
-        n.slug = "slack"
-        url = "https://sentry.io/"
-        assert n.add_notification_referrer_param(url) == url + "?referrer=" + n.slug
-
-        url = "https://sentry.io/?referrer=notslack"
-        assert n.add_notification_referrer_param(url) == "https://sentry.io/?referrer=slack"
-
-        url = "https://sentry.io/?utm_source=google"
-        with_referrer = n.add_notification_referrer_param(url)
-
-        # XXX(py3): Handle ordering differences between py2/3
-        assert parse_qs(urlparse(with_referrer).query) == parse_qs(
-            "referrer=slack&utm_source=google"
-        )
-
-        n.slug = ""
-        url = "https://sentry.io/"
-        assert n.add_notification_referrer_param(url) == "https://sentry.io/"
-
     def test_notify_failure(self):
         errors = (
             ApiError("The server is sad"),