Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperator.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperator.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperator.java
deleted file mode 100644
index 2b854d8313e9a2c042a46367632d16c2dde7faae..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsUnaryOperator.java
+++ /dev/null
@@ -1,78 +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 unary operator.
- */
-public enum JsUnaryOperator implements JsOperator {
-
-  /*
-   * Precedence indices from "JavaScript - The Definitive Guide" 4th Edition
-   * (page 57)
-   */
-  BIT_NOT("~", 14, PREFIX), DEC("--", 14, POSTFIX | PREFIX), DELETE("delete", 14, PREFIX), INC(
-      "++", 14, POSTFIX | PREFIX), NEG("-", 14, PREFIX), POS("+", 14, PREFIX),
-  NOT("!", 14, PREFIX), TYPEOF("typeof", 14, PREFIX), VOID("void", 14, PREFIX);
-
-  private final int mask;
-  private final int precedence;
-  private final String symbol;
-
-  private JsUnaryOperator(String symbol, int precedence, int mask) {
-    this.symbol = symbol;
-    this.precedence = precedence;
-    this.mask = mask;
-  }
-
-  @Override
-  public int getPrecedence() {
-    return precedence;
-  }
-
-  @Override
-  public String getSymbol() {
-    return symbol;
-  }
-
-  @Override
-  public boolean isKeyword() {
-    return this == DELETE || this == TYPEOF || this == VOID;
-  }
-
-  @Override
-  public boolean isLeftAssociative() {
-    return (mask & LEFT) != 0;
-  }
-
-  public boolean isModifying() {
-    return this == DEC || this == INC || this == DELETE;
-  }
-
-  @Override
-  public boolean isPrecedenceLessThan(JsOperator other) {
-    return precedence < other.getPrecedence();
-  }
-
-  @Override
-  public boolean isValidInfix() {
-    return (mask & INFIX) != 0;
-  }
-
-  @Override
-  public boolean isValidPostfix() {
-    return (mask & POSTFIX) != 0;
-  }
-
-  @Override
-  public boolean isValidPrefix() {
-    return (mask & PREFIX) != 0;
-  }
-
-  @Override
-  public String toString() {
-    return symbol;
-  }
-}