remove unused methods

Author: KengoTODA

src/main/java/difflib/DiffRowGenerator.java

@@ -50,7 +50,6 @@ public class DiffRowGenerator {
 
     private final boolean showInlineDiffs;
     private final boolean ignoreWhiteSpaces;
-    private final boolean ignoreBlankLines;
     private final String InlineOldTag;
     private final String InlineNewTag;
     private final String InlineOldCssClass;
@@ -68,7 +67,6 @@ public class DiffRowGenerator {
     public static class Builder {
         private boolean showInlineDiffs = false;
         private boolean ignoreWhiteSpaces = false;
-        private boolean ignoreBlankLines = false;
         private String InlineOldTag = "span";
         private String InlineNewTag = "span";
         private String InlineOldCssClass = "editOldInline";
@@ -97,16 +95,6 @@ public Builder ignoreWhiteSpaces(boolean val) {
             return this;
         }
 
-        /**
-         * Ignore blank lines in generating diff rows or not.
-         * @param val the value to set. Default: true.
-         * @return builder with configured ignoreBlankLines parameter
-         */
-        public Builder ignoreBlankLines(boolean val) {
-            ignoreBlankLines = val;
-            return this;
-        }
-
         /**
          * Set the tag used for displaying changes in the original text.
          * @param tag the tag to set. Without angle brackets. Default: span.
@@ -177,7 +165,6 @@ public DiffRowGenerator build() {
     private DiffRowGenerator(Builder builder) {
         showInlineDiffs = builder.showInlineDiffs;
         ignoreWhiteSpaces = builder.ignoreWhiteSpaces; //
-        ignoreBlankLines = builder.ignoreBlankLines; //
         InlineOldTag = builder.InlineOldTag;
         InlineNewTag = builder.InlineNewTag;
         InlineOldCssClass = builder.InlineOldCssClass;
@@ -211,17 +198,6 @@ public List<DiffRow> generateDiffRows(List<String> original, List<String> revise
         return generateDiffRows(original, revised, DiffUtils.diff(original, revised, equalizer));
     }
 
-    private List<String> removeBlankLines(List<String> lines) {
-        List<String> result = new ArrayList<String>();
-        for (String line: lines) {
-            if (line.trim().length() == 0) {
-                result.add("");
-            }
-            result.add(line);
-        }
-        return result;
-    }
-
     /**
      * Generates the DiffRows describing the difference between original and revised texts using the
      * given patch. Useful for displaying side-by-side diff.