Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsCatchScope.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsCatchScope.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsCatchScope.java
deleted file mode 100644
index 6c9ce22a0e883fe5185e2034d80677bfffa31067..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsCatchScope.java
+++ /dev/null
@@ -1,75 +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;
-
-import java.util.Iterator;
-import java.util.NoSuchElementException;
-
-/**
- * A special scope used only for catch blocks. It only holds a single symbol:
- * the catch argument's name.
- */
-public class JsCatchScope extends JsScope {
-
-  private final JsName name;
-
-  public JsCatchScope(JsScope parent, String ident) {
-    super(parent, "Catch scope");
-    this.name = new JsName(this, ident, ident, ident);
-  }
-
-  @Override
-  public JsName declareName(String ident) {
-    // Declare into parent scope!
-    return getParent().declareName(ident);
-  }
-
-  @Override
-  public JsName declareName(String ident, String shortIdent) {
-    // Declare into parent scope!
-    return getParent().declareName(ident, shortIdent);
-  }
-
-  @Override
-  public Iterator<JsName> getAllNames() {
-    return new Iterator<JsName>() {
-      private boolean didIterate = false;
-
-      @Override
-      public boolean hasNext() {
-        return !didIterate;
-      }
-
-      @Override
-      public JsName next() {
-        if (didIterate) {
-          throw new NoSuchElementException();
-        }
-        didIterate = true;
-        return name;
-      }
-
-      @Override
-      public void remove() {
-        throw new UnsupportedOperationException();
-      }
-
-    };
-  }
-
-  @Override
-  protected JsName doCreateName(String ident, String shortIdent, String originalName) {
-    throw new UnsupportedOperationException("Cannot create a name in a catch scope");
-  }
-
-  @Override
-  protected JsName findExistingNameNoRecurse(String ident) {
-    if (name.getIdent().equals(ident)) {
-      return name;
-    } else {
-      return null;
-    }
-  }
-}