Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsStringLiteral.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsStringLiteral.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsStringLiteral.java
deleted file mode 100644
index 77e60c9b89a1b086ea790fff888d6e0aa2e817ad..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsStringLiteral.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 string literal expression.
- */
-public final class JsStringLiteral extends JsValueLiteral {
-
-  private final String value;
-
-  // These only get created by JsProgram so that they can be interned.
-  JsStringLiteral(String value) {
-    this.value = value;
-  }
-
-  public String getValue() {
-    return value;
-  }
-
-  @Override
-  public boolean isBooleanFalse() {
-    return value.length() == 0;
-  }
-
-  @Override
-  public boolean isBooleanTrue() {
-    return value.length() != 0;
-  }
-
-  @Override
-  public boolean isDefinitelyNotNull() {
-    return true;
-  }
-
-  @Override
-  public boolean isDefinitelyNull() {
-    return false;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    v.visit(this, ctx);
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.STRING;
-  }
-}