Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsBinaryOperation.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsBinaryOperation.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsBinaryOperation.java
deleted file mode 100644
index b09d50c1d058fcc64d443f0415b05bacda36cbec..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsBinaryOperation.java
+++ /dev/null
@@ -1,107 +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;
-
-/**
- * Represents a JavaScript binary operation.
- */
-public final class JsBinaryOperation extends JsExpression {
-
-  private JsExpression arg1;
-  private JsExpression arg2;
-  private final JsBinaryOperator op;
-
-  public JsBinaryOperation(JsBinaryOperator op) {
-    this(op, null, null);
-  }
-
-  public JsBinaryOperation(JsBinaryOperator op, JsExpression arg1, JsExpression arg2) {
-    this.op = op;
-    this.arg1 = arg1;
-    this.arg2 = arg2;
-  }
-
-  public JsExpression getArg1() {
-    return arg1;
-  }
-
-  public JsExpression getArg2() {
-    return arg2;
-  }
-
-  public JsBinaryOperator getOperator() {
-    return op;
-  }
-
-  @Override
-  public boolean hasSideEffects() {
-    return op.isAssignment() || arg1.hasSideEffects() || arg2.hasSideEffects();
-  }
-
-  @Override
-  public boolean isDefinitelyNotNull() {
-    // Precarious coding, but none of these can have null results.
-    if (op.getPrecedence() > 5) {
-      return true;
-    }
-    if (op == JsBinaryOperator.OR) {
-      if (arg1 instanceof CanBooleanEval) {
-        if (((CanBooleanEval) arg1).isBooleanTrue()) {
-          assert arg1.isDefinitelyNotNull();
-          return true;
-        }
-      }
-    }
-    // AND and OR can return nulls
-    if (op.isAssignment()) {
-      if (op == JsBinaryOperator.ASG) {
-        return arg2.isDefinitelyNotNull();
-      } else {
-        // All other ASG's are math ops.
-        return true;
-      }
-    }
-
-    if (op == JsBinaryOperator.COMMA) {
-      return arg2.isDefinitelyNotNull();
-    }
-
-    return false;
-  }
-
-  @Override
-  public boolean isDefinitelyNull() {
-    if (op == JsBinaryOperator.AND) {
-      return arg1.isDefinitelyNull();
-    }
-    return false;
-  }
-
-  public void setArg1(JsExpression arg1) {
-    this.arg1 = arg1;
-  }
-
-  public void setArg2(JsExpression arg2) {
-    this.arg2 = arg2;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      if (op.isAssignment()) {
-        arg1 = v.acceptLvalue(arg1);
-      } else {
-        arg1 = v.accept(arg1);
-      }
-      arg2 = v.accept(arg2);
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.BINARY_OP;
-  }
-}