WebStateList is an array of web::WebState* wrappers.

ios/chrome/browser/tabs/tab_model_unittest.mm

Index: ios/chrome/browser/tabs/tab_model_unittest.mm
diff --git a/ios/chrome/browser/tabs/tab_model_unittest.mm b/ios/chrome/browser/tabs/tab_model_unittest.mm
index dfb7c664fa0765e6c3ba4fd5579ab33ee0a8d3b1..e298a8cbc12b2166c1519e7c8ddce7883b1bad18 100644
--- a/ios/chrome/browser/tabs/tab_model_unittest.mm
+++ b/ios/chrome/browser/tabs/tab_model_unittest.mm
@@ -838,6 +838,7 @@ TEST_F(TabModelTest, SetParentModel) {
 TEST_F(TabModelTest, PersistSelectionChange) {
   TestChromeBrowserState::Builder test_cbs_builder;
   auto chrome_browser_state = test_cbs_builder.Build();
+  base::mac::ScopedNSAutoreleasePool pool;
 
   NSString* stashPath =
       base::SysUTF8ToNSString(chrome_browser_state->GetStatePath().value());
@@ -875,6 +876,7 @@ TEST_F(TabModelTest, PersistSelectionChange) {
                browserState:chrome_browser_state.get()]);
   EXPECT_EQ(model.get().currentTab, [model tabAtIndex:1]);
   [model browserStateDestroyed];
+  model.reset();
 
   // Clean up.
   EXPECT_TRUE([[NSFileManager defaultManager] removeItemAtPath:stashPath