Add type annoation.

Change-Id: Idb0b5db3a2116b71ab1aaa7e55d332144ff2b8fb
diff --git a/src/com/android/settings/biometrics2/factory/BiometricsViewModelFactory.java b/src/com/android/settings/biometrics2/factory/BiometricsViewModelFactory.java
index 477fdb6..a9f4356 100644
--- a/src/com/android/settings/biometrics2/factory/BiometricsViewModelFactory.java
+++ b/src/com/android/settings/biometrics2/factory/BiometricsViewModelFactory.java
@@ -42,7 +42,7 @@
     private static final String TAG = "BiometricsViewModelFact";
 
     public static final CreationExtras.Key<ChallengeGenerator> CHALLENGE_GENERATOR =
-            new CreationExtras.Key<>() {};
+            new CreationExtras.Key<ChallengeGenerator>() {};
 
     @NonNull
     @Override