Remove the contents of tools/valgrind/tsan.

tools/valgrind/tsan/PRESUBMIT.py

-# 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.
-"""
-See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
-for more details on the presubmit API built into gcl.
-"""
-
-
-def CheckChange(input_api, output_api):
-  """Checks the TSan suppressions files for bad suppressions."""
-
-  # TODO(timurrrr): find out how to do relative imports
-  # and remove this ugly hack. Also, the CheckChange function won't be needed.
-  tools_vg_path = input_api.os_path.join(input_api.PresubmitLocalPath(), '..')
-  import sys
-  old_path = sys.path
-  try:
-    sys.path = sys.path + [tools_vg_path]
-    import suppressions
-    return suppressions.PresubmitCheck(input_api, output_api)
-  finally:
-    sys.path = old_path
-
-
-def CheckChangeOnUpload(input_api, output_api):
-  return CheckChange(input_api, output_api)
-
-
-def CheckChangeOnCommit(input_api, output_api):
-  return CheckChange(input_api, output_api)
-
-
-def GetPreferredTryMasters(project, change):
-  return {
-    'tryserver.chromium': {
-      'linux_tsan': set(['defaulttests']),
-    }
-  }