Removes unused 'normalized' field in many AST nodes.

compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java

Index: compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java b/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
index 96d1c0d45a5f99e71c978ca72d613f0384f14535..6fc7fbb9ad51a32a1c901222f561a599642c8dfd 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
@@ -15,7 +15,6 @@ public class DartBinaryExpression extends DartExpression implements ElementRefer
   private final Token op;
   private DartExpression arg1;
   private DartExpression arg2;
-  private DartExpression normalizedNode = this;
   private Element referencedElement;
 
   public DartBinaryExpression(Token op, DartExpression arg1, DartExpression arg2) {
@@ -38,16 +37,6 @@ public class DartBinaryExpression extends DartExpression implements ElementRefer
     return op;
   }
 
-  public void setNormalizedNode(DartExpression normalizedNode) {
-    normalizedNode.setSourceInfo(this);
-    this.normalizedNode = normalizedNode;
-  }
-
-  @Override
-  public DartExpression getNormalizedNode() {
-    return normalizedNode;
-  }
-
   @Override
   public void traverse(DartVisitor v, DartContext ctx) {
     if (v.visit(this, ctx)) {