Remove trailing whitespace in files

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=135386752

java/google/registry/model/domain/fee/FeeCheckCommandExtensionItem.java

@@ -26,7 +26,7 @@ public interface FeeCheckCommandExtensionItem extends FeeQueryCommandExtensionIt
 
   /** The domain name being checked; throws an exception if domain names are not supported. */
   public String getDomainName() throws UnsupportedOperationException;
-  
+
   /** Create a builder for a matching fee check response item. */
   public FeeCheckResponseExtensionItem.Builder createResponseBuilder();
 }