pkg/compiler: fix imports

pkg/compiler/lib/src/scanner/array_based_scanner.dart

 // 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.
 
 library dart2js.scanner.array_based;
 
 import '../io/source_file.dart' show SourceFile;
 import '../tokens/keyword.dart' show Keyword;
 import '../tokens/precedence.dart' show PrecedenceInfo;
 import '../tokens/precedence_constants.dart' as Precedence
     show COMMENT_INFO, EOF_INFO;
 import '../tokens/token.dart'
     show BeginGroupToken, ErrorToken, KeywordToken, SymbolToken, Token;
 import '../tokens/token_constants.dart' as Tokens
     show LT_TOKEN, OPEN_CURLY_BRACKET_TOKEN, STRING_INTERPOLATION_TOKEN;
 import '../util/characters.dart' show $LF, $STX;
 import '../util/util.dart' show Link;
-
 import 'scanner.dart' show AbstractScanner;
 
 abstract class ArrayBasedScanner extends AbstractScanner {
   ArrayBasedScanner(SourceFile file, bool includeComments)
       : super(file, includeComments);
 
   /**
    * The stack of open groups, e.g [: { ... ( .. :]
    * Each BeginGroupToken has a pointer to the token where the group
    * ends. This field is set when scanning the end group token.
@@ skipping 196 matching lines @@
    * something which cannot possibly be part of a type parameter/argument
    * list, like the '=' in the above example.
    */
   void discardOpenLt() {
     while (!groupingStack.isEmpty &&
         identical(groupingStack.head.kind, Tokens.LT_TOKEN)) {
       groupingStack = groupingStack.tail;
     }
   }
 }