Remove a debugging print.

lib/src/runner/browser/platform.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:async/async.dart';
 import 'package:http_multi_server/http_multi_server.dart';
@@ skipping 253 matching lines @@
     return suite;
   }
 
   /// Returns whether the test at [path] has precompiled JS available underneath
   /// `_config.precompiledPath`.
   bool _precompiled(String path) {
     if (_config.precompiledPath == null) return false;
     var jsPath =
         p.join(_config.precompiledPath, p.relative(path, from: _root)) +
             ".browser_test.dart.js";
-    print("does $jsPath exist? ${new File(jsPath).existsSync()}");
     return new File(jsPath).existsSync();
   }
 
   StreamChannel loadChannel(String path, TestPlatform platform) =>
       throw new UnimplementedError();
 
   /// Loads a test suite at [path] from the `pub serve` URL [dartUrl].
   ///
   /// This ensures that only one suite is loaded at a time, and that any errors
   /// are exposed as [LoadException]s.
@@ skipping 153 matching lines @@
     await Future.wait(futures);
 
     if (_config.pubServeUrl == null) {
       new Directory(_compiledDir).deleteSync(recursive: true);
     } else {
       _http.close();
     }
   });
   final _closeMemo = new AsyncMemoizer();
 }