Mac: Make ScopedTypeRef require explicit constructors

ios/chrome/browser/passwords/password_controller_unittest.mm

Index: ios/chrome/browser/passwords/password_controller_unittest.mm
diff --git a/ios/chrome/browser/passwords/password_controller_unittest.mm b/ios/chrome/browser/passwords/password_controller_unittest.mm
index 70c19cc3474f46eeba4dc4b1c783c7ab952379eb..7757fe291c68abe8b21a1ed81c1a441ba1326487 100644
--- a/ios/chrome/browser/passwords/password_controller_unittest.mm
+++ b/ios/chrome/browser/passwords/password_controller_unittest.mm
@@ -72,10 +72,10 @@ void SetSuspended(bool suspended) override {}
       .WillByDefault(testing::Return(browser_state.get()));
   auto client = base::WrapUnique(new MockPasswordManagerClient);
   MockPasswordManagerClient* weak_client = client.get();
-  base::scoped_nsobject<PasswordController> passwordController =
+  base::scoped_nsobject<PasswordController> passwordController(
       [[PasswordController alloc] initWithWebState:&web_state
                                passwordsUiDelegate:nil
-                                            client:std::move(client)];
+                                            client:std::move(client)]);
 
   // Use a mock LogManager to detect that OnPasswordFormsRendered has been
   // called. TODO(crbug.com/598672): this is a hack, we should modularize the