Remove JavaStringBuilder

pkg/analyzer/lib/src/generated/source.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.source;
 
 import 'dart:collection';
@@ skipping 788 matching lines @@
     if (end <= other.offset) {
       return false;
     }
     if (offset >= other.end) {
       return false;
     }
     return true;
   }
 
   /**
-   * @return `true` if this [SourceRange] starts in <code>otherRange</code>.
+   * Return `true` if this [SourceRange] starts in the [otherRange].
    */
   bool startsIn(SourceRange otherRange) => otherRange.contains(offset);
 
   @override
-  String toString() {
-    JavaStringBuilder builder = new JavaStringBuilder();
-    builder.append("[offset=");
-    builder.append(offset);
-    builder.append(", length=");
-    builder.append(length);
-    builder.append("]");
-    return builder.toString();
-  }
+  String toString() => '[offset=$offset, length=$length]';
 }
 
 /**
  * The interface `ContentReceiver` defines the behavior of objects that can receive the
  * content of a source.
  */
 abstract class Source_ContentReceiver {
   /**
    * Accept the contents of a source.
    *
@@ skipping 77 matching lines @@
 
   /**
    * Return an absolute URI that represents the given source, or `null` if a valid URI cannot
    * be computed.
    *
    * @param source the source to get URI for
    * @return the absolute URI representing the given source
    */
   Uri restoreAbsolute(Source source) => null;
 }