gadget: remove unused references

Author: Meulengracht

gadget/update_test.go

@@ -701,29 +701,6 @@ func (m *mockUpdateProcessObserver) UpdateApplied() error {
 func (m *mockUpdateProcessObserver) Done() {
 }
 
-type mockPostApplyObserver struct {
-	mockUpdateProcessObserver
-	observeAction       gadget.ContentChangeAction
-	observeErr          error
-	observeCalled       int
-	updateAppliedCalled int
-	doneCalled          int
-}
-
-func (m *mockPostApplyObserver) Observe(op gadget.ContentOperation, partRole, targetRootDir, relativeTargetPath string, data *gadget.ContentChange) (gadget.ContentChangeAction, error) {
-	m.observeCalled++
-	return m.observeAction, m.observeErr
-}
-
-func (m *mockPostApplyObserver) UpdateApplied() error {
-	m.updateAppliedCalled++
-	return nil
-}
-
-func (m *mockPostApplyObserver) Done() {
-	m.doneCalled++
-}
-
 func (u *updateTestSuite) TestUpdateApplyHappy(c *C) {
 	oldData, newData, rollbackDir := u.updateDataSet(c)
 	// update two structs