Autopilot tests fail on vivid because the name of the calculator desktop file changed

Three tests are failing on vivid with a trace like this:

_StringException: Binary content:
  FailedTestScreenshot (image/png)

test-log: {{{
18:24:44.094 ERROR content:47 - Could not add content object 'None' due to IO Error: [Errno 13] Permission denied: '/var/log/syslog'
18:24:44.095 DEBUG _video:79 - Starting: ['/usr/bin/recordmydesktop', '--no-sound', '--no-frame', '-o', '/tmp/autopilot/autopilot.tests.functional.test_process_emulator.ProcessEmulatorTests.test_start_app_window.ogv']
18:24:45.103 INFO _bamf:156 - Starting application 'Calculator' with files [] in locale C
}}}

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/autopilot/tests/functional/test_process_emulator.py", line 94, in test_start_app_window
    app = self.process_manager.start_app_window('Calculator', locale='C')
  File "/usr/lib/python3/dist-packages/autopilot/process/_bamf.py", line 137, in start_app_window
    window = self._open_window(app_name, files, locale)
  File "/usr/lib/python3/dist-packages/autopilot/process/_bamf.py", line 162, in _open_window
    self._launch_application(app['desktop-file'], files)
  File "/usr/lib/python3/dist-packages/autopilot/process/_bamf.py", line 326, in _launch_application
    proc = _launch_application(desktop_file, files)
  File "/usr/lib/python3/dist-packages/autopilot/process/_bamf.py", line 333, in _launch_application
    proc = Gio.DesktopAppInfo.new(desktop_file)
TypeError: constructor returned NULL

Gio.DesktopAppInfo is failing because it doesn't find the desktop file. It doesn't find the desktop file, because it's name has been updated.