Remove code that requires whole-program compile

bin/dartdevc.dart

 #!/usr/bin/env 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.
 
 /// Runs dev_compiler's checker, and optionally the code generator.
 /// Also can run a server for local development.
 library dev_compiler.bin.dartdevc;
 
 import 'dart:io';
 
 import 'package:dev_compiler/devc.dart' show devCompilerVersion;
 import 'package:dev_compiler/src/compiler.dart'
     show validateOptions, compile, setupLogger;
 import 'package:dev_compiler/src/options.dart';
-import 'package:dev_compiler/src/server/server.dart' show DevServer;
 
 const String _appName = 'dartdevc';
 
 void _showUsageAndExit() {
   print('usage: dartdevc [<options>] <file.dart>...\n');
   print('<file.dart> is one or more Dart files to process.\n');
   print('<options> include:\n');
   print(argParser.usage);
   exit(1);
 }
 
 main(List<String> args) {
   var options;
 
   try {
     options = validateOptions(args);
   } on FormatException catch (e) {
     print('${e.message}\n');
     _showUsageAndExit();
   }
 
   if (options == null || options.help) _showUsageAndExit();
   if (options.version) {
     print('${_appName} version ${devCompilerVersion}');
     exit(0);
   }
 
   setupLogger(options.logLevel, print);
-
-  if (options.serverMode) {
-    new DevServer(options).start();
-  } else {
-    exit(compile(options) ? 0 : 1);
-  }
+  bool success = compile(options);
+  exit(success ? 0 : 1);
 }