Move builders.py and steps.py to chromium_tests.

scripts/slave/recipe_modules/chromium_tests/client_v8_fyi.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-v8',
   },
@@ skipping 302 matching lines @@
       'cf_gs_acl': 'public-read',
       'cf_archive_name': 'syzyasan',
       'cf_revision_dir': 'v8',
       'fixed_staging_dir': True,
       'compile_targets': ['chromium_builder_asan'],
       'set_component_rev': {'name': 'src/v8', 'rev_str': '%s'},
       'testing': {'platform': 'win'},
     },
   },
 }