Some nit fixes.

Author: vverman

oauth2_http/java/com/google/auth/oauth2/ExternalAccountCredentials.java

@@ -638,10 +638,6 @@ public String getServiceAccountEmail() {
   public String getTrustBoundaryUrl() throws IOException {
     if (isWorkforcePoolConfiguration()) {
       Matcher matcher = WORKFORCE_PATTERN.matcher(getAudience());
-      if (!matcher.matches()) {
-        throw new IOException(
-            "The provided audience is not in the correct format for a workforce pool.");
-      }
       String poolId = matcher.group("pool");
       return String.format(WORKFORCE_POOL_URL_FORMAT, poolId);
     } else {

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

@@ -32,7 +32,14 @@
 package com.google.auth.oauth2;
 
 import static com.google.auth.Credentials.GOOGLE_DEFAULT_UNIVERSE;
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
 import com.google.api.client.http.HttpTransport;
 import com.google.api.client.json.GenericJson;