Fix warnings in dart2js.

dart/lib/compiler/implementation/scanner/array_based_scanner.dart

Index: dart/lib/compiler/implementation/scanner/array_based_scanner.dart
diff --git a/dart/lib/compiler/implementation/scanner/array_based_scanner.dart b/dart/lib/compiler/implementation/scanner/array_based_scanner.dart
index d9b4b3bdfd0e6f95eac3fd52ddf6093c5e41d2cb..2647582a7be1bc76820bad56c042ba676158b091 100644
--- a/dart/lib/compiler/implementation/scanner/array_based_scanner.dart
+++ b/dart/lib/compiler/implementation/scanner/array_based_scanner.dart
@@ -2,7 +2,7 @@
 // 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.
 
-class ArrayBasedScanner<S extends SourceString> extends AbstractScanner<S> {
+abstract class ArrayBasedScanner<S extends SourceString> extends AbstractScanner<S> {

[karlklose, 2012/10/08 13:35:37]

Long line.

[ahe, 2012/10/08 13:38:03]

Done.

   int get charOffset => byteOffset + extraCharOffset;
   final Token tokens;
   Token tail;