Remove the checker and corresponding dead code

lib/src/server/server.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.
 
 /// Development server that compiles Dart to JS on the fly.
 library dev_compiler.src.server;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 192 matching lines @@
   final String _entryPath;
 
   factory DevServer(CompilerOptions options) {
     assert(options.inputs.length == 1);
 
     var fileResolvers = createFileResolvers(options.sourceOptions);
     if (options.sourceOptions.useImplicitHtml) {
       fileResolvers.insert(0, _createImplicitEntryResolver(options.inputs[0]));
     }
 
-    var context = createAnalysisContextWithSources(
-        options.strongOptions, options.sourceOptions,
+    var context = createAnalysisContextWithSources(options.sourceOptions,
         fileResolvers: fileResolvers);
 
     var entryPath = path.basename(options.inputs[0]);
     var extension = path.extension(entryPath);
     if (extension != '.html' && !options.sourceOptions.useImplicitHtml) {
       print('error: devc in server mode requires an HTML or Dart entry point.');
       exit(1);
     }
 
     // TODO(sigmund): allow running without a dir, but keep output in memory?
@@ skipping 77 matching lines @@
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     var src = resolver.resolveAbsolute(uri, actualUri);
     return src.exists() ? src : null;
   }
 
   Uri restoreAbsolute(Source source) => resolver.restoreAbsolute(source);
 }
 
 final _log = new Logger('dev_compiler.src.server');
 final _earlyErrorResult = new CheckerResults(const [], true);