Formatting installations test (#1467)

Author: ashwinraghav

firebase-installations/src/test/java/com/google/firebase/installations/FirebaseInstallationsTest.java

@@ -17,7 +17,6 @@
 import static com.google.common.truth.Truth.assertWithMessage;
 import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;