Fix RotationTest inheritance in ActivityEmbedding

Bug: 310969700
Test: <flicker tests in presubmit>
Change-Id: I6869855047eac8aa662358011158f0c2e449e0de
diff --git a/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotateSplitNoChangeTest.kt b/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotateSplitNoChangeTest.kt
index e8389d19..0dce870 100644
--- a/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotateSplitNoChangeTest.kt
+++ b/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotateSplitNoChangeTest.kt
@@ -43,8 +43,6 @@
 @Parameterized.UseParametersRunnerFactory(FlickerParametersRunnerFactory::class)
 @FixMethodOrder(MethodSorters.NAME_ASCENDING)
 open class RotateSplitNoChangeTest(flicker: LegacyFlickerTest) : RotationTransition(flicker) {
-
-    override val testApp = ActivityEmbeddingAppHelper(instrumentation)
     override val transition: FlickerBuilder.() -> Unit
         get() = {
             super.transition(this)
diff --git a/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotationTransition.kt b/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotationTransition.kt
index 1123c5b..f6d51f9 100644
--- a/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotationTransition.kt
+++ b/tests/FlickerTests/ActivityEmbedding/src/com/android/server/wm/flicker/activityembedding/rotation/RotationTransition.kt
@@ -18,17 +18,14 @@
 
 import android.platform.test.annotations.Presubmit
 import android.tools.common.traces.component.ComponentNameMatcher
-import android.tools.device.apphelpers.StandardAppHelper
 import android.tools.device.flicker.legacy.FlickerBuilder
 import android.tools.device.flicker.legacy.LegacyFlickerTest
-import com.android.server.wm.flicker.BaseTest
+import com.android.server.wm.flicker.activityembedding.ActivityEmbeddingTestBase
 import com.android.server.wm.flicker.helpers.setRotation
 import org.junit.Test
 
 /** Base class for app rotation tests */
-abstract class RotationTransition(flicker: LegacyFlickerTest) : BaseTest(flicker) {
-    protected abstract val testApp: StandardAppHelper
-
+abstract class RotationTransition(flicker: LegacyFlickerTest) : ActivityEmbeddingTestBase(flicker) {
     /** {@inheritDoc} */
     override val transition: FlickerBuilder.() -> Unit = {
         setup { this.setRotation(flicker.scenario.startRotation) }