Cleanup: Remove the remaining instance of ChromiumTestShell from Telemetry scripts.

tests/data/trymail_tests/android_failure.in

 {
   'build_step_props': {
     'blamelist': [u'iannucci@chromium.org'],
     'branch': None,
     'buildername': 'android_dbg_triggered_tests',
     'buildnumber': 25183,
     'got_nacl_revision': 10619,
     'got_revision': 177980,
     'got_v8_revision': 13451,
     'got_webkit_revision': 140209,
@@ skipping 55 matching lines @@
     step('gpu_unittests'),
     step('ipc_tests'),
     step('media_unittests'),
     step('net_unittests'),
     step('sql_unittests'),
     step('sync_unit_tests'),
     step('ui_unittests'),
     step('unit_tests'),
     step('webkit_compositor_bindings_unittests'),
     step('androidwebview_instrumentation_tests'),
-    step('chromiumtestshell_instrumentation_tests'),
+    step('chromeshell_instrumentation_tests'),
     step('contentshell_instrumentation_tests'),
     step('logcat_dump'),
     step('test_report'),
   ],
   'master': {
     'getTitle()': 'Title',
     'getBuildbotURL()': 'http://build.chromium.org/p/tryserver.chromium/',
   },
 }