Remove backends.

compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperation.java

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperation.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperation.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperation.java
deleted file mode 100644
index 00f103f35c960efa588535c78779c46b8b02fd3d..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperation.java
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-package com.google.dart.compiler.backend.js.ast;
-
-/**
- * A JavaScript prefix or postfix operation.
- */
-public abstract class JsUnaryOperation extends JsExpression {
-
-  private JsExpression arg;
-
-  private final JsUnaryOperator op;
-
-  public JsUnaryOperation(JsUnaryOperator op) {
-    this(op, null);
-  }
-
-  public JsUnaryOperation(JsUnaryOperator op, JsExpression arg) {
-    super();
-    this.op = op;
-    this.arg = arg;
-  }
-
-  public JsExpression getArg() {
-    return arg;
-  }
-
-  public JsUnaryOperator getOperator() {
-    return op;
-  }
-
-  @Override
-  public final boolean hasSideEffects() {
-    return op.isModifying() || arg.hasSideEffects();
-  }
-
-  public void setArg(JsExpression arg) {
-    this.arg = arg;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (op.isModifying()) {
-      // The delete operator is practically like an assignment of undefined, so
-      // for practical purposes we're treating it as an lvalue.
-      arg = v.acceptLvalue(arg);
-    } else {
-      arg = v.accept(arg);
-    }
-  }
-}