Remove redundant import statements

DEVSIX-1428

Author: yulian-gaponenko

kernel/src/main/java/com/itextpdf/kernel/pdf/PdfXrefTable.java

@@ -44,8 +44,6 @@ This file is part of the iText (R) project.
 package com.itextpdf.kernel.pdf;
 
 import com.itextpdf.io.source.ByteUtils;
-import com.itextpdf.io.util.DecimalFormatUtil;
-import com.itextpdf.kernel.PdfException;
 import com.itextpdf.kernel.Version;
 
 import java.io.IOException;
@@ -55,8 +53,6 @@ This file is part of the iText (R) project.
 import java.util.List;
 import java.util.TreeSet;
 
-import static com.itextpdf.kernel.pdf.PdfObject.ORIGINAL_OBJECT_STREAM;
-
 class PdfXrefTable implements Serializable {
 
     private static final long serialVersionUID = 4171655392492002944L;