fix for 1.12.0-dev SDK and 0.25.1 analyzer breaking changes

lib/strong_mode.dart

 // Copyright (c) 2015, 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.
 
 /// Types needed to implement "strong" checking in the Dart analyzer.
 /// This is intended to be used by analyzer_cli and analysis_server packages.
 library dev_compiler.strong_mode;
 
 import 'package:analyzer/src/generated/engine.dart'
     show AnalysisContextImpl, AnalysisErrorInfo, AnalysisErrorInfoImpl;
@@ skipping 45 matching lines @@
 
     // TODO(jmesserly): change DDC to emit ErrorCodes directly.
     _reporter._log = (Message msg) {
       // Skip hints unless requested.
       if (msg.level < Level.WARNING && !_options.hints) return;
 
       var errorCodeFactory = _levelToErrorCode[msg.level];
       var category = '${msg.runtimeType}';
       var errorCode = errorCodeFactory(category, msg.message);
       var len = msg.end - msg.begin;
-      errors.add(new AnalysisError.con2(source, msg.begin, len, errorCode));
+      errors.add(new AnalysisError(source, msg.begin, len, errorCode));
     };
 
     for (Source librarySource in _context.getLibrariesContaining(source)) {
       var resolved = _context.resolveCompilationUnit2(source, librarySource);
       _checker.visitCompilationUnit(resolved);
     }
     _reporter._log = null;
     return new AnalysisErrorInfoImpl(errors, _context.getLineInfo(source));
   }
 }
@@ skipping 125 matching lines @@
 List<String> _optionsToList(String option,
     {List<String> defaultValue: const <String>[]}) {
   if (option == null) {
     return defaultValue;
   } else if (option.isEmpty) {
     return <String>[];
   } else {
     return option.split(',');
   }
 }