change delete to _delete

Author: Feiyang1

packages-exp/app-exp/src/api.test.ts

@@ -187,7 +187,7 @@ describe('API tests', () => {
         'test1' as any,
         _container =>
           ({
-            delete: async () => {
+            _delete: async () => {
               await Promise.resolve();
               expect(count).to.equal(0);
               count++;

packages-exp/functions-exp/src/service.ts

@@ -95,7 +95,7 @@ export class FunctionsService implements _FirebaseService {
     });
   }
 
-  delete(): Promise<void> {
+  _delete(): Promise<void> {
     return this.deleteService();
   }