[ios] Clean how WebUsageEnabled flag is restored for WebStateList.

ios/chrome/browser/web_state_list/web_state_list_serialization_unittest.mm

Index: ios/chrome/browser/web_state_list/web_state_list_serialization_unittest.mm
diff --git a/ios/chrome/browser/web_state_list/web_state_list_serialization_unittest.mm b/ios/chrome/browser/web_state_list/web_state_list_serialization_unittest.mm
index 321bbcce79b28493e65efcebb4962111f5495d61..b4af185d511b88530493c99b217438a19782212c 100644
--- a/ios/chrome/browser/web_state_list/web_state_list_serialization_unittest.mm
+++ b/ios/chrome/browser/web_state_list/web_state_list_serialization_unittest.mm
@@ -130,7 +130,7 @@ TEST_F(WebStateListSerializationTest, SerializationRoundTrip) {
   ASSERT_EQ(1, restored_web_state_list.count());
 
   DeserializeWebStateList(
-      &restored_web_state_list, session_window, false,
+      &restored_web_state_list, session_window,
       base::BindRepeating(&SerializableTestWebState::CreateWithSessionStorage));
 
   EXPECT_EQ(5, restored_web_state_list.count());
@@ -138,33 +138,7 @@ TEST_F(WebStateListSerializationTest, SerializationRoundTrip) {
   ExpectRelationshipIdenticalFrom(1, &original_web_state_list,
                                   &restored_web_state_list);
 
-  // Create a deserialized WebStateList with web usage enabled and verify its
-  // contents.
-  WebStateList restored_web_state_list_web_usage_enabled(
-      web_state_list_delegate());
-  std::unique_ptr<web::WebState> webUsageEnabledWebState =
-      SerializableTestWebState::Create();
-  webUsageEnabledWebState->SetWebUsageEnabled(true);
-  restored_web_state_list_web_usage_enabled.InsertWebState(
-      0, std::move(webUsageEnabledWebState));
-  ASSERT_EQ(1, restored_web_state_list_web_usage_enabled.count());
-
-  DeserializeWebStateList(
-      &restored_web_state_list_web_usage_enabled, session_window, true,
-      base::BindRepeating(&SerializableTestWebState::CreateWithSessionStorage));
-
-  EXPECT_EQ(5, restored_web_state_list_web_usage_enabled.count());
-  EXPECT_EQ(2, restored_web_state_list_web_usage_enabled.active_index());
-  ExpectRelationshipIdenticalFrom(1, &original_web_state_list,
-                                  &restored_web_state_list_web_usage_enabled);
-
-  // Verify that the WebUsageEnabled bit is set appropriately for the restored
-  // WebStateLists.
-  ASSERT_EQ(restored_web_state_list_web_usage_enabled.count(),
-            restored_web_state_list.count());
-  for (int i = 0; i < restored_web_state_list.count(); ++i) {
-    EXPECT_TRUE(restored_web_state_list_web_usage_enabled.GetWebStateAt(i)
-                    ->IsWebUsageEnabled());
+  // Verify that the WebUsageEnabled bit is left to default value.
+  for (int i = 0; i < restored_web_state_list.count(); ++i)
     EXPECT_FALSE(restored_web_state_list.GetWebStateAt(i)->IsWebUsageEnabled());
-  }
 }