Get rid of #source in pub.

utils/pub/git_source.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.
 
+#library('git_source');
+
+#import('io.dart');
+#import('package.dart');
+#import('source.dart');
+#import('utils.dart');
+
 /**
  * A package source that installs packages from Git repos.
  */
 class GitSource extends Source {
   final String name = "git";
 
   // TODO(rnystrom): Git packages could in theory be cached, but that adds a
   // lot of complexity. When you install a git package, you are installing
   // and pinning to a specific commit. That means different installs of the
   // same git path but at different commits need to be disambiguated in the
@@ skipping 30 matching lines @@
 
   /**
    * Ensures [description] is a Git URL.
    */
   void validateDescription(description) {
     if (description is! String) {
       throw new FormatException("The description must be a git URL.");
     }
   }
 }