Remove a non-existent directory from export_tarball.py.

scripts/slave/recipe_modules/chromium/resources/export_tarball.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 This tool creates a tarball with all the sources, but without .git directories.
 
 It can also remove files which are not strictly required for build, so that
 the resulting tarball can be reasonably small (last time it was ~110 MB).
@@ skipping 34 matching lines @@
     'tools/gyp/test',
     'v8/test',
 )
 
 ESSENTIAL_FILES = (
     'chrome/test/data/webui/i18n_process_css_test.html',
 )
 
 TEST_DIRS = (
     'breakpad/src/processor/testdata',
-    'chrome/browser/resources/tracing/tests',
     'chrome/test/data',
     'content/test/data',
     'courgette/testdata',
     'media/test/data',
     'native_client/src/trusted/service_runtime/testdata',
     'net/data',
 )
 
 
 # Workaround lack of the exclude parameter in add method in python-2.4.
@@ skipping 116 matching lines @@
 
   if rc != 0:
     print 'xz -9 failed!'
     return 1
 
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv[1:]))