Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsThrow.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsThrow.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsThrow.java
deleted file mode 100644
index 4616418fb6b2fcfcd194738d73bdf86a6a68d4ea..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsThrow.java
+++ /dev/null
@@ -1,48 +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 <code>throw</code> statement.
- */
-public class JsThrow extends JsStatement {
-
-  private JsExpression expr;
-
-  public JsThrow() {
-    super();
-  }
-
-  public JsThrow(JsExpression expr) {
-    super();
-    this.expr = expr;
-  }
-
-  public JsExpression getExpr() {
-    return expr;
-  }
-
-  public void setExpr(JsExpression expr) {
-    this.expr = expr;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      expr = v.accept(expr);
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public boolean unconditionalControlBreak() {
-    return true;
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.THROW;
-  }
-}