Minor: removed unused ChameleonJsExpression.

js/js.dart-ast/src/com/google/dart/compiler/backend/js/ast/ChameleonJsExpression.java

@@ -1,68 +0,0 @@
-package com.google.dart.compiler.backend.js.ast;
-import com.google.dart.compiler.util.AstUtil;
-
-import org.jetbrains.annotations.NotNull;
-
-import org.jetbrains.annotations.NotNull;
-
-public class ChameleonJsExpression implements JsExpression {
-    private JsExpression expression;
-
-    public ChameleonJsExpression(JsExpression initialExpression) {
-        expression = initialExpression;
-    }
-
-    public ChameleonJsExpression() {
-    }
-
-    public void resolve(JsExpression expression) {
-        this.expression = expression;
-    }
-
-    @Override
-    public boolean isLeaf() {
-        return expression.isLeaf();
-    }
-
-    @Override
-    @NotNull
-    public JsStatement makeStmt() {
-        return expression.makeStmt();
-    }
-
-    @Override
-    public void accept(JsVisitor visitor) {
-        expression.accept(visitor);
-    }
-
-    @Override
-    public void acceptChildren(JsVisitor visitor) {
-        expression.acceptChildren(visitor);
-    }
-
-    @Override
-    public Object getSource() {
-        return expression.getSource();
-    }
-
-    @Override
-    public void setSource(Object info) {
-        expression.setSource(info);
-    }
-
-    @Override
-    public JsExpression source(Object info) {
-        return expression.source(info);
-    }
-
-    @Override
-    public void traverse(JsVisitorWithContext visitor, JsContext ctx) {
-        expression.traverse(visitor, ctx);
-    }
-
-    @NotNull
-    @Override
-    public ChameleonJsExpression deepCopy() {
-        return new ChameleonJsExpression(AstUtil.deepCopy(expression));
-    }
-}