PDFBOX-6111: remove method that throws a ClassCastException

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1930124 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

xmpbox/src/main/java/org/apache/xmpbox/schema/XMPMediaManagementSchema.java

@@ -782,16 +782,6 @@ public ArrayProperty getHistoryProperty()
         return (ArrayProperty) getProperty(HISTORY);
     }
 
-    /**
-     * Get List of History values
-     * 
-     * @return List of History values
-     */
-    public List<String> getHistory()
-    {
-        return getUnqualifiedSequenceValueList(HISTORY);
-    }
-
     // --------------------------------------- Ingredients
     // ----------------------------