Move builders.py and steps.py to chromium_tests.

scripts/slave/recipes/chromium_trybot_legacy.py

Index: scripts/slave/recipes/chromium_trybot_legacy.py
diff --git a/scripts/slave/recipes/chromium_trybot_legacy.py b/scripts/slave/recipes/chromium_trybot_legacy.py
index a08315042dd1df5549e6daa1959db18f93c47f63..93c3c881e952f298820fe04b66ec4b2523f0ef27 100644
--- a/scripts/slave/recipes/chromium_trybot_legacy.py
+++ b/scripts/slave/recipes/chromium_trybot_legacy.py
@@ -234,7 +234,7 @@ def _GenStepsInternal(api):
       if isinstance(test_args, basestring):
         test_args = [test_args]
 
-      test = api.chromium.steps.GTestTest(test_name, test_args)
+      test = api.chromium_tests.steps.GTestTest(test_name, test_args)
       assert not test.uses_swarming
 
       gtest_tests.append(test)
@@ -337,16 +337,16 @@ def _GenStepsInternal(api):
     conditional_tests = []
     if bot_config.get('add_nacl_integration_tests', True):
       conditional_tests += [
-          api.chromium.steps.ScriptTest(
+          api.chromium_tests.steps.ScriptTest(
               'nacl_integration', 'nacl_integration.py',
               scripts_compile_targets),
       ]
     if bot_config.get('add_telemetry_tests', True):
       conditional_tests += [
-          api.chromium.steps.ScriptTest(
+          api.chromium_tests.steps.ScriptTest(
               'telemetry_unittests', 'telemetry_unittests.py',
               scripts_compile_targets),
-          api.chromium.steps.ScriptTest(
+          api.chromium_tests.steps.ScriptTest(
               'telemetry_perf_unittests', 'telemetry_perf_unittests.py',
               scripts_compile_targets),
       ]
@@ -378,7 +378,7 @@ def _GenStepsInternal(api):
     tests.extend(find_test_named('nacl_integration', conditional_tests))
 
     if api.platform.is_win:
-      tests.append(api.chromium.steps.MiniInstallerTest())
+      tests.append(api.chromium_tests.steps.MiniInstallerTest())
 
     # Swarming uses Isolate to transfer files to swarming bots.
     # set_isolate_environment modifies GYP_DEFINES to enable test isolation.