Base64Utils falls back to JAXB DatatypeConverter for String-based encoding

Issue: SPR-12938

spring-web/src/main/java/org/springframework/http/converter/json/GsonBuilderUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -52,10 +52,6 @@ public abstract class GsonBuilderUtils {
 	 * On Java 8, the standard {@link java.util.Base64} facility is used instead.
 	 */
 	public static GsonBuilder gsonBuilderWithBase64EncodedByteArrays() {
-		// Assert that Base64 support is available, as long we're not on Java 8+
-		Base64Utils.encode(null);
-
-		// Now, construct a pre-configured GsonBuilder...
 		GsonBuilder builder = new GsonBuilder();
 		builder.registerTypeHierarchyAdapter(byte[].class, new Base64TypeAdapter());
 		return builder;