Remove some deprecated/unused code

service/src/main/java/org/whispersystems/textsecuregcm/configuration/URLDeserializationConverter.java

@@ -1,22 +0,0 @@
-/*
- * Copyright 2021 Signal Messenger, LLC
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-package org.whispersystems.textsecuregcm.configuration;
-
-import com.fasterxml.jackson.databind.util.StdConverter;
-import java.net.MalformedURLException;
-import java.net.URL;
-
-final class URLDeserializationConverter extends StdConverter<String, URL> {
-
-  @Override
-  public URL convert(final String value) {
-    try {
-      return new URL(value);
-    } catch (MalformedURLException e) {
-      throw new IllegalArgumentException(e);
-    }
-  }
-}

service/src/main/java/org/whispersystems/textsecuregcm/registration/IdentityTokenCallCredentials.java

@@ -124,10 +124,6 @@ public class IdentityTokenCallCredentials extends CallCredentials implements Man
     }
   }
 
-  @Override
-  public void thisUsesUnstableApi() {
-  }
-
   @Override
   public void stop() {
     synchronized (this) {