Convert filesystem_apptests to shelltests.

mojo/tools/data/apptests

 # This file contains a list of Mojo gtest unit tests.
 #
 # This must be valid Python. It may use the |config| global that will be a
 # mopy.config.Config object, and must set a |tests| global that will contain the
 # list of tests to run.
 #
 # The entries in |tests| are dictionaries of the following form:
 #   {
 #     # Required URL for apptest.
 #     'test': 'mojo:test_app_url',
@@ skipping 21 matching lines @@
   #{
   #  'test': 'mojo:runner_apptests',
   #  'type': 'gtest_isolated',
   #},
 ]
 
 # TODO(msw): Get these tests passing on Android too. http://crbug.com/486220
 if config.target_os != config.OS_ANDROID:
   tests += [
     {
-      'test': 'mojo:filesystem_apptests',
-      'type': 'gtest_isolated',
-    },
-    {
       'test': 'mojo:mash_wm_apptests',
       'type': 'gtest_isolated',
       'args': ['--use-x11-test-config',
                '--override-use-gl-with-osmesa-for-tests']
     },
     {
       'test': 'mojo:media_apptests',
       'type': 'gtest_isolated',
     },
     # TODO(media): these tests fail in debug, which has no bot-coverage.
     # http://crbug.com/587523
 #    {
 #      'test': 'mojo:media_pipeline_integration_apptests',
 #      'type': 'gtest_isolated',
 #    },
     {
       'test': 'mojo:leveldb_apptests',
       'type': 'gtest_isolated',
     }
   ]