pkg/docgen: remove test print

pkg/docgen/test/generate_json_test.dart

 import 'dart:convert';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import 'util.dart';
 import '../lib/docgen.dart' as dg;
 
@@ skipping 10 matching lines @@
        });
      });
 
      currentSchedule.onComplete.schedule(() {
        d.defaultRoot = null;
        return tempDir.delete(recursive: true);
      });
    });
 
   test('json output', () {
-    print(d.defaultRoot);
-
     schedule(() {
       var codeDir = getMultiLibraryCodePath();
       expect(FileSystemEntity.isDirectorySync(codeDir), isTrue);
       return dg.docgen(['$codeDir/'], out: p.join(d.defaultRoot, 'docs'));
     });
 
     d.dir('docs', [
         d.matcherFile('index.json', _isJsonMap),
         d.matcherFile('index.txt', isNotNull),
         d.matcherFile('library_list.json', _isJsonMap),
         d.matcherFile('testLib-bar.C.json', _isJsonMap),
         d.matcherFile('testLib-bar.json', _isJsonMap),
         d.matcherFile('testLib.A.json', _isJsonMap),
         d.matcherFile('testLib.B.json', _isJsonMap),
         d.matcherFile('testLib.C.json', _isJsonMap),
         d.matcherFile('testLib.json', _isJsonMap),
         d.matcherFile('testLib2-foo.B.json', _isJsonMap),
         d.matcherFile('testLib2-foo.json', _isJsonMap)
     ]).validate();
   });
 }
 
 final Matcher _isJsonMap = predicate((input) {
   try {
     return JSON.decode(input) is Map;
   } catch (e) {
     return false;
   }
 }, 'Output is JSON encoded Map');