pkg/docgen: forgot to remove a 'print', unused import

pkg/docgen/lib/docgen.dart

 // Copyright (c) 2013, 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.
 
 /// **docgen** is a tool for creating machine readable representations of Dart
 /// code metadata, including: classes, members, comments and annotations.
 ///
 /// docgen is run on a `.dart` file or a directory containing `.dart` files.
 ///
 ///      $ dart docgen.dart [OPTIONS] [FILE/DIR]
@@ skipping 667 matching lines @@
    * project and the other content is removed.
    */
   static String get viewerCodePath {
     if(_viewerCodePath == null) {
       var pubspecFileName = 'pubspec.yaml';
 
       var thePath = _dartdocViewerDir.path;
 
       if(!FileSystemEntity.isFileSync(path.join(thePath, pubspecFileName))) {
         thePath = path.join(thePath, 'client');
-        print('trying the fallback: $thePath');
         if (!FileSystemEntity.isFileSync(path.join(thePath, pubspecFileName))) {
           throw new StateError('Could not find a pubspec file');
         }
       }
 
       _viewerCodePath = thePath;
     }
     return _viewerCodePath;
   }
 
@@ skipping 1534 matching lines @@
         .map((e) => originalMirror.getField(e.simpleName).reflectee)
         .where((e) => e != null)
         .toList();
   }
 
   Map toMap() => {
     'name': Indexable.getDocgenObject(mirror, owningLibrary).docName,
     'parameters': parameters
   };
 }