Remove backends.

compiler/javatests/com/google/dart/compiler/end2end/inc/MemoryLibrarySource.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.end2end.inc;
 
 import com.google.common.collect.Maps;
 import com.google.dart.compiler.DartSource;
 import com.google.dart.compiler.LibrarySource;
 import com.google.dart.compiler.Source;
 import com.google.dart.compiler.UrlDartSource;
 
 import java.io.IOException;
 import java.io.Reader;
 import java.io.StringReader;
 import java.net.URI;
 import java.net.URISyntaxException;
-import java.util.Date;
 import java.util.Map;
 
 /**
  * {@link LibrarySource} which provides content for all {@link Source}s from memory.
  */
 public class MemoryLibrarySource implements LibrarySource {
   private final String libName;
   private final String libContent;
   private final Map<String, String> sourceContentMap = Maps.newHashMap();
   private final Map<String, Long> sourceLastModifiedMap = Maps.newHashMap();
@@ skipping 68 matching lines @@
         return new StringReader(content);
       }
     };
   }
 
   /**
    * Sets the given content for the source.
    */
   public void setContent(String relPath, String content) {
     sourceContentMap.put(relPath, content);
-    sourceLastModifiedMap.put(relPath, new Date().getTime());
+    sourceLastModifiedMap.put(relPath, System.currentTimeMillis());
   }
 }