Remove backends.

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

-// 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;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * A JavaScript <code>try</code> statement.
- */
-public class JsTry extends JsStatement {
-
-  private final List<JsCatch> catches = new ArrayList<JsCatch>();
-  private JsBlock finallyBlock;
-  private JsBlock tryBlock;
-
-  public JsTry() {
-    super();
-  }
-
-  public List<JsCatch> getCatches() {
-    return catches;
-  }
-
-  public JsBlock getFinallyBlock() {
-    return finallyBlock;
-  }
-
-  public JsBlock getTryBlock() {
-    return tryBlock;
-  }
-
-  public void setFinallyBlock(JsBlock block) {
-    this.finallyBlock = block;
-  }
-
-  public void setTryBlock(JsBlock block) {
-    tryBlock = block;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      tryBlock = v.accept(tryBlock);
-      v.acceptWithInsertRemove(catches);
-      if (finallyBlock != null) {
-        finallyBlock = v.accept(finallyBlock);
-      }
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.TRY;
-  }
-}