Makes this class abstract so that Tradefed's automatic search for runnable test classes doesn't get confused by this class.

Bug: b/174168302
Change-Id: I765e3f6c7f8ef2f2734862e75513e73353fea4c0
diff --git a/tests/robotests/src/com/android/settings/bluetooth/BluetoothDetailsControllerTestBase.java b/tests/robotests/src/com/android/settings/bluetooth/BluetoothDetailsControllerTestBase.java
index 7313321..6401388 100644
--- a/tests/robotests/src/com/android/settings/bluetooth/BluetoothDetailsControllerTestBase.java
+++ b/tests/robotests/src/com/android/settings/bluetooth/BluetoothDetailsControllerTestBase.java
@@ -41,7 +41,7 @@
 import org.robolectric.RuntimeEnvironment;
 
 @RunWith(RobolectricTestRunner.class)
-public class BluetoothDetailsControllerTestBase {
+public abstract class BluetoothDetailsControllerTestBase {
 
     protected Context mContext;
     private LifecycleOwner mLifecycleOwner;