update frompkcs8

Author: mpeddada1

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

@@ -112,7 +112,7 @@ private ServiceAccountJwtAccessCredentials(
         privateKeyId,
         null,
         null,
-        Credentials.GOOGLE_DEFAULT_UNIVERSE);
+        null);
   }
 
   /**
@@ -123,8 +123,7 @@ private ServiceAccountJwtAccessCredentials(
    * @param privateKey RSA private key object for the service account.
    * @param privateKeyId Private key identifier for the service account. May be null.
    * @param defaultAudience Audience to use if not provided by transport. May be null.
-   * @param universeDomain universe domain in the format some-domain.xyz. By default, returns
-   *     googleapis.com.
+   * @param universeDomain universe domain in the format some-domain.xyz.
    */
   private ServiceAccountJwtAccessCredentials(
       String clientId,
@@ -235,7 +234,7 @@ public static ServiceAccountJwtAccessCredentials fromPkcs8(
         privateKeyId,
         defaultAudience,
         null,
-        Credentials.GOOGLE_DEFAULT_UNIVERSE);
+        null);
   }
 
   static ServiceAccountJwtAccessCredentials fromPkcs8(

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

@@ -875,7 +875,7 @@ public void fromJSON_UniverseDomainSet() throws IOException {
   }
 
   @Test
-  public void fromPkcs8_DefaultUniverseDomain() throws IOException {
+  public void fromPkcs8_NoUniverseDomain() throws IOException {
     ServiceAccountJwtAccessCredentials credentials =
         ServiceAccountJwtAccessCredentials.fromPkcs8(
             SA_CLIENT_ID, SA_CLIENT_EMAIL, SA_PRIVATE_KEY_PKCS8, SA_PRIVATE_KEY_ID);
@@ -884,7 +884,7 @@ public void fromPkcs8_DefaultUniverseDomain() throws IOException {
     assertEquals(
         OAuth2Utils.privateKeyFromPkcs8(SA_PRIVATE_KEY_PKCS8), credentials.getPrivateKey());
     assertNull(credentials.getQuotaProjectId());
-    assertEquals(GOOGLE_DEFAULT_UNIVERSE, credentials.getUniverseDomain());
+    assertNull(credentials.getUniverseDomain());
   }
 
   @Test