Fix and cleanup Mojo and Mandoline python scripts.

mojo/tools/mopy/dart_apptest.py

-# Copyright 2014 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.
-
-import logging
-
-_logging = logging.getLogger()
-
-from mopy import test_util
-from mopy.print_process_error import print_process_error
-
-
-# TODO(erg): Support android, launched services and fixture isolation.
-def run_test(config, shell, apptest_dict, shell_args, apps_and_args=None):
-  """Runs a command line and checks the output for signs of gtest failure.
-
-  Args:
-    config: The mopy.config.Config object for the build.
-    shell_args: The arguments for mojo_shell.
-    apps_and_args: A Dict keyed by application URL associated to the
-        application's specific arguments.
-  """
-  apps_and_args = apps_and_args or {}
-  output = test_util.try_run_test(config, shell, shell_args, apps_and_args)
-  # Fail on output with dart unittests' "FAIL:"/"ERROR:" or a lack of "PASS:".
-  # The latter condition ensures failure on broken command lines or output.
-  # Check output instead of exit codes because mojo_shell always exits with 0.
-  if (not output or
-      '\nFAIL: ' in output or
-      '\nERROR: ' in output or
-      '\nPASS: ' not in output):
-    print "Failed test:"
-    print_process_error(
-        test_util.build_command_line(config, shell_args, apps_and_args),
-        output)
-    return "Failed test(s) in %r" % apptest_dict
-  _logging.debug("Succeeded with output:\n%s" % output)
-  return "Succeeded"