Lint fix.

Author: vverman

oauth2_http/javatests/com/google/auth/oauth2/IdentityPoolCredentialsTest.java

@@ -40,7 +40,6 @@
 import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.junit.jupiter.api.Assertions.fail;
 
 import com.google.api.client.http.HttpTransport;
 import com.google.api.client.json.GenericJson;