Lint fixes.

Author: vverman

google-auth-library-java/oauth2_http/javatests/com/google/auth/oauth2/AwsCredentialsTest.java

@@ -32,7 +32,6 @@
 package com.google.auth.oauth2;
 
 import static com.google.auth.Credentials.GOOGLE_DEFAULT_UNIVERSE;
-import static org.junit.jupiter.api.Assertions.fail;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;

google-auth-library-java/oauth2_http/javatests/com/google/auth/oauth2/ComputeEngineCredentialsTest.java

@@ -34,7 +34,6 @@
 import static com.google.auth.oauth2.ComputeEngineCredentials.METADATA_RESPONSE_EMPTY_CONTENT_ERROR_MESSAGE;
 import static com.google.auth.oauth2.ImpersonatedCredentialsTest.SA_CLIENT_EMAIL;
 import static com.google.auth.oauth2.RegionalAccessBoundary.X_ALLOWED_LOCATIONS_HEADER_KEY;
-import static org.junit.jupiter.api.Assertions.fail;
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;

google-auth-library-java/oauth2_http/javatests/com/google/auth/oauth2/ExternalAccountAuthorizedUserCredentialsTest.java

@@ -32,7 +32,6 @@
 package com.google.auth.oauth2;
 
 import static com.google.auth.Credentials.GOOGLE_DEFAULT_UNIVERSE;
-import static org.junit.jupiter.api.Assertions.fail;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
@@ -44,7 +43,6 @@
 import com.google.api.client.http.HttpTransport;
 import com.google.api.client.json.GenericJson;
 import com.google.api.client.testing.http.MockLowLevelHttpRequest;
-import com.google.api.client.util.Clock;
 import com.google.auth.TestUtils;
 import com.google.auth.http.AuthHttpConstants;
 import com.google.auth.http.HttpTransportFactory;

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

@@ -35,8 +35,6 @@
 import static com.google.auth.oauth2.MockExternalAccountCredentialsTransport.SERVICE_ACCOUNT_IMPERSONATION_URL;
 import static com.google.auth.oauth2.OAuth2Utils.JSON_FACTORY;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
-import static org.junit.jupiter.api.Assertions.assertNull;
-import static org.junit.jupiter.api.Assertions.fail;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;

google-auth-library-java/oauth2_http/javatests/com/google/auth/oauth2/ImpersonatedCredentialsTest.java

@@ -32,7 +32,6 @@
 package com.google.auth.oauth2;
 
 import static com.google.auth.oauth2.RegionalAccessBoundary.X_ALLOWED_LOCATIONS_HEADER_KEY;
-import static org.junit.jupiter.api.Assertions.fail;
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;