Update FlutterFragmentActivityTest.java

Author: hannah-hyj

shell/platform/android/test/io/flutter/embedding/android/FlutterFragmentActivityTest.java

@@ -23,8 +23,6 @@
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import io.flutter.FlutterInjector;
 import io.flutter.embedding.android.FlutterActivityLaunchConfigs.BackgroundMode;
-import io.flutter.embedding.android.FlutterFragmentActivityTest.FlutterFragmentActivityWithProvidedEngine;
-import io.flutter.embedding.android.FlutterFragmentActivityTest.FlutterFragmentActivityWithRootLayout.CustomLayout;
 import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.embedding.engine.FlutterJNI;
 import io.flutter.embedding.engine.loader.FlutterLoader;