Get rid of #source in pub.

utils/pub/pub.dart

 // Copyright (c) 2012, 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.
 
 /**
  * The main entrypoint for the pub command line application.
  */
 #library('pub');
 
 #import('io.dart');
+#import('command_install.dart');
+#import('command_list.dart');
+#import('command_update.dart');
+#import('command_version.dart');
+#import('entrypoint.dart');
+#import('git_source.dart');
+#import('package.dart');
 #import('pubspec.dart');
+#import('sdk_source.dart');
 #import('source.dart');
+#import('source_registry.dart');
+#import('system_cache.dart');
 #import('utils.dart');
 #import('version.dart');
 
-#source('command_list.dart');
-#source('command_install.dart');
-#source('command_update.dart');
-#source('command_version.dart');
-#source('entrypoint.dart');
-#source('package.dart');
-#source('system_cache.dart');
-
 Version get pubVersion() => new Version(0, 0, 0);
 
 main() {
   var args = new Options().arguments;
 
   // TODO(rnystrom): In addition to explicit "help" and "version" commands,
   // should also add special-case support for --help and --version arguments to
   // be consistent with other Unix apps.
   var commands = {
     'list': new ListCommand(),
@@ skipping 136 matching lines @@
     }).handleException(handleError);
   }
 
   /**
    * Override this to perform the specific command. Return a future that
    * completes when the command is done or fails if the command fails. If the
    * command is synchronous, it may return `null`.
    */
   abstract Future onRun();
 }