De-duplicate steps between chromium and chromium_trybot recipes

scripts/slave/recipe_modules/chromium/chromium_chromiumos.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.
 
 from . import steps
 
 SPEC = {
   'settings': {
     'build_gs_bucket': 'chromium-chromiumos-archive',
   },
@@ skipping 39 matching lines @@
         'unit_tests',
         'url_unittests',
         'views_unittests',
       ],
       'tests': [
         steps.ArchiveBuildStep(
             'chromium-browser-snapshots',
             gs_acl='public-read',
         ),
         steps.Deps2GitTest(),
-        steps.Deps2SubmodulesTest(),

[agable, 2014/06/27 18:34:42]

Why is this removed in this CL? I mean, it should be removed, because submodules
are no longer supported, but maybe it should be a separate CL. Also, I don't see
any corresponding expectations updates.

[Paweł Hajdan Jr., 2014/06/27 18:58:22]

That's right, because nothing changes. Deps2Git from the tryserver runs
deps2submodules under the hood.

I'm happy to add a TODO or something to sort this out as a follow-up.

[agable, 2014/06/27 21:04:22]

That's terrifying that deps2git runs it, and that having this step then
*doesn't* run it because it's already been run. Or something like that.
Aaaaaaahh.

         steps.CheckpermsTest(),
       ],
       'testing': {
         'platform': 'linux',
       },
     },
 
     'Linux ChromiumOS Builder': {
       'recipe_config': 'chromium_chromeos',
       'chromium_config_kwargs': {
@@ skipping 139 matching lines @@
       'tests': [
         steps.DynamicGTestTests('Linux ChromiumOS Tests (dbg)(3)'),
       ],
       'parent_buildername': 'Linux ChromiumOS Builder (dbg)',
       'testing': {
         'platform': 'linux',
       },
     },
   },
 }