Removes unused 'normalized' field in many AST nodes.

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

Index: compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java b/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
index cdd336d777e5e00f419f640ca6e290621c0737c1..afde4ec22f7ef035578779b311dde2ea7f8ba174 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
@@ -17,7 +17,6 @@ public class DartMethodDefinition extends DartClassMember<DartExpression> {
 
   protected DartFunction function;
   private MethodElement element;
-  private DartMethodDefinition normalizedNode = this;
 
   public static DartMethodDefinition create(DartExpression name,
                                             DartFunction function,
@@ -50,16 +49,6 @@ public class DartMethodDefinition extends DartClassMember<DartExpression> {
     element = (MethodElement) symbol;
   }
 
-  public void setNormalizedNode(DartMethodDefinition normalizedNode) {
-    normalizedNode.setSourceInfo(this);
-    this.normalizedNode = normalizedNode;
-  }
-
-  @Override
-  public DartMethodDefinition getNormalizedNode() {
-    return normalizedNode;
-  }
-
   public List<DartInitializer> getInitializers() {
     return Collections.emptyList();
   }