Remove unused code, change error msg

config/bidderinfo.go

@@ -571,7 +571,7 @@ func validateSyncer(bidderInfo BidderInfo) error {
 	}
 
 	if bidderInfo.Syncer.FormatOverride != ResponseFormatIFrame && bidderInfo.Syncer.FormatOverride != ResponseFormatRedirect && bidderInfo.Syncer.FormatOverride != "" {
-		return fmt.Errorf("syncer could not be created, invalid FormatOverride value: %s", bidderInfo.Syncer.FormatOverride)
+		return fmt.Errorf("syncer could not be created, invalid format override value: %s", bidderInfo.Syncer.FormatOverride)
 	}
 
 	for _, supports := range bidderInfo.Syncer.Supports {

config/bidderinfo_test.go

@@ -1350,7 +1350,7 @@ func TestBidderInfoValidationNegative(t *testing.T) {
 				},
 			},
 			[]error{
-				errors.New("syncer could not be created, invalid FormatOverride value: x"),
+				errors.New("syncer could not be created, invalid format override value: x"),
 			},
 		},
 	}

endpoints/cookie_sync_test.go

@@ -2109,10 +2109,6 @@ func (m *MockSyncer) GetSync(syncTypes []usersync.SyncType, privacyMacros macros
 	return args.Get(0).(usersync.Sync), args.Error(1)
 }
 
-func (m *MockSyncer) ForceResponseFormat() string {
-	return ""
-}
-
 type MockAnalyticsRunner struct {
 	mock.Mock
 }

endpoints/setuid_test.go

@@ -1738,10 +1738,6 @@ func (s fakeSyncer) GetSync(syncTypes []usersync.SyncType, privacyMacros macros.
 	return usersync.Sync{}, nil
 }
 
-func (s fakeSyncer) ForceResponseFormat() string {
-	return s.formatOverride
-}
-
 func ToHTTPCookie(cookie *usersync.Cookie) (*http.Cookie, error) {
 	encoder := usersync.Base64Encoder{}
 	encodedCookie, err := encoder.Encode(cookie)

usersync/chooser_test.go

@@ -744,10 +744,6 @@ func (fakeSyncer) GetSync([]SyncType, macros.UserSyncPrivacy) (Sync, error) {
 	return Sync{}, nil
 }
 
-func (s fakeSyncer) ForceResponseFormat() string {
-	return s.formatOverride
-}
-
 type fakePrivacy struct {
 	gdprAllowsHostCookie  bool
 	gdprAllowsBidderSync  bool