Remove unused support files for old version of tools/test.py.

frog/tests/await/testcfg.py

-# Copyright (c) 2011, 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.
-
-from testing import test_configuration
-import os.path
-
-FROG_DIR = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
-AWAITC_LOCATION = os.path.join(FROG_DIR, 'await', 'awaitc.dart')
-
-class AwaitConfiguration(test_configuration.StandardTestConfiguration):
-  """
-    Defines a configuration that runs an await-aware frog compiler on
-    each test case.
-  """
-  # TODO(sigmund): This configuration should eventually be removed when we have
-  # a generic way to run preprocessors in the test infrastructure.
-  def __init__(self, context, root, fatal_static_type_errors=False):
-    super(AwaitConfiguration, self).__init__(context, root)
-    self.fatal_static_type_errors = fatal_static_type_errors
-
-  def ListTests(self, current_path, path, mode, arch, component):
-    """Uses the default listing of test cases, but modifies the architecture to
-    use the await-aware frog compiler."""
-    tests = super(AwaitConfiguration, self).ListTests(
-        current_path, path, mode, arch, component)
-    for test in tests:
-      test.run_arch.vm_options.append(AWAITC_LOCATION)
-    return tests
-
-def GetConfiguration(context, root):
-  return AwaitConfiguration(context, root)