Revert of Cross-repo recipe package system.

scripts/slave/recipes/chromium_trybot_legacy.py

 # Copyright 2015 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.
 
-import itertools
-
-from recipe_engine.types import freeze
+from infra.libs.infra_types import freeze
 
 DEPS = [
   'bot_update',
   'chromium',
   'chromium_android',
   'chromium_tests',
   'gclient',
   'gpu',
   'isolate',
+  'itertools',
   'json',
   'path',
   'platform',
   'properties',
   'python',
   'raw_io',
   'step',
   'swarming',
   'test_utils',
   'tryserver',
@@ skipping 362 matching lines @@
     try:
       api.chromium.runhooks(name='runhooks (with patch)')
     except api.step.StepFailure:
       # As part of deapplying patch we call runhooks without the patch.
       api.chromium_tests.deapply_patch(bot_update_step)
       raise
 
     if bot_config.get('use_isolate'):
       api.isolate.clean_isolated_files(api.chromium.output_dir)
 
-    compile_targets.extend(itertools.chain(
+    compile_targets.extend(api.itertools.chain(
         *[t.compile_targets(api) for t in tests]))
     # Remove duplicate targets.
     compile_targets = sorted(set(compile_targets))
     try:
       api.chromium.compile(compile_targets, name='compile (with patch)')
     except api.step.StepFailure:
       api.chromium_tests.deapply_patch(bot_update_step)
       api.chromium.compile(
           compile_targets, name='compile (without patch)')
       raise
@@ skipping 11 matching lines @@
 
   mastername = api.properties.get('mastername')
   buildername = api.properties.get('buildername')
   api.chromium_tests.configure_swarming('chromium', precommit=True)
 
   tests, bot_update_step = compile_and_return_tests(
       mastername, buildername)
 
   def deapply_patch_fn(failing_tests):
     api.chromium_tests.deapply_patch(bot_update_step)
-    compile_targets = sorted(list(set(itertools.chain(
+    compile_targets = sorted(list(set(api.itertools.chain(
         *[t.compile_targets(api) for t in failing_tests]))))
     if compile_targets:
       api.chromium.compile(
           compile_targets, name='compile (without patch)')
 
   return api.test_utils.determine_new_failures(api, tests, deapply_patch_fn)
 
 
 def RunSteps(api):
   with api.tryserver.set_failure_hash():
@@ skipping 408 matching lines @@
             'test': 'base_tests',
             'args': ['--gtest-filter: *NaCl*.*'],
           },
         ],
       })
     ) +
     api.override_step_data(
       'analyze',
       api.json.output({'invalid_targets': ['invalid target', 'another one']}))
   )