Only one action bar needed

And it's provided by the Activity.

Test: notification history does not crash
Bug: 184695659
Change-Id: I5a4c882c42b894601306826006152684bb499b51

AndroidManifest.xml

@@ -1296,7 +1296,7 @@
         <activity
             android:name=".notification.history.NotificationHistoryActivity"
             android:exported="true"
-            android:theme="@android:style/Theme.DeviceDefault.DayNight"
+            android:theme="@style/Theme.NotificationHistory"
             android:label="@string/notification_history_title">
             <intent-filter android:priority="1">
                 <action android:name="android.settings.NOTIFICATION_HISTORY" />

res/values/themes.xml

@@ -280,4 +280,9 @@
         <item name="colorPrimary">@*android:color/primary_device_default_settings_light</item>
         <item name="colorAccent">@*android:color/accent_device_default_light</item>
     </style>
+
+    <style name="Theme.NotificationHistory" parent="@android:style/Theme.DeviceDefault.DayNight">
+        <item name="android:windowActionBar">false</item>
+        <item name="android:windowNoTitle">true</item>
+    </style>
 </resources>