Fix 'Unused local variable' hints in analyzer and analysis_server.

pkg/analysis_server/test/services/correction/fix_test.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.
 
 library test.services.correction.fix;
 
 import 'package:analysis_server/src/protocol.dart' hide AnalysisError;
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
@@ skipping 61 matching lines @@
     List<Fix> fixes = computeFixes(searchEngine, testUnit, error);
     for (Fix fix in fixes) {
       if (fix.kind == kind) {
         throw fail('Unexpected fix $kind in\n${fixes.join('\n')}');
       }
     }
   }
 
   Position expectedPosition(String search) {
     int offset = resultCode.indexOf(search);
-    int length = getLeadingIdentifierLength(search);
     return new Position(testFile, offset);
   }
 
   List<Position> expectedPositions(List<String> patterns) {
     List<Position> positions = <Position>[];
     patterns.forEach((String search) {
       positions.add(expectedPosition(search));
     });
     return positions;
   }
@@ skipping 2217 matching lines @@
     if (checkHasSingleError) {
       expect(errors, hasLength(1));
     }
     return errors[0];
   }
 
   List<Position> _findResultPositions(List<String> searchStrings) {
     List<Position> positions = <Position>[];
     for (String search in searchStrings) {
       int offset = resultCode.indexOf(search);
-      int length = getLeadingIdentifierLength(search);
       positions.add(new Position(testFile, offset));
     }
     return positions;
   }
 
   void _indexTestUnit(String code) {
     resolveTestUnit(code);
     index.indexUnit(context, testUnit);
   }
 }