Revert of Add mojo python bindings tests to the waterfalls.

scripts/slave/recipe_modules/chromium/steps.py

Index: scripts/slave/recipe_modules/chromium/steps.py
diff --git a/scripts/slave/recipe_modules/chromium/steps.py b/scripts/slave/recipe_modules/chromium/steps.py
index b6a593082055c3bf4c11c1fdacb75d2b909eb70e..9546ab4c9750b8a47b7c4346703177cc307b38c4 100644
--- a/scripts/slave/recipe_modules/chromium/steps.py
+++ b/scripts/slave/recipe_modules/chromium/steps.py
@@ -525,31 +525,13 @@
                       **kwargs)
 
 
-class MojoPythonBindingsTests(PythonBasedTest):  # pylint: disable=W0232
-  name = 'mojo_python_bindings_tests'
-
-  def run_step(self, api, suffix, cmd_args, **kwargs):
-    component = api.chromium.c.gyp_env.GYP_DEFINES.get('component', None)
-    # Python modules are not build for the component build.
-    if component == 'shared_library':
-      return None
-    args = cmd_args
-    args.extend(['--build-dir', api.chromium.c.build_dir])
-    return api.python(
-        self._step_name(suffix),
-        api.path['checkout'].join('mojo', 'tools',
-                                  'run_mojo_python_bindings_tests.py'),
-        args,
-        **kwargs)
-
-
 class PrintPreviewTests(PythonBasedTest):  # pylint: disable=W032
   name = 'print_preview_tests'
 
   def run_step(self, api, suffix, cmd_args, **kwargs):
     platform_arg = '.'.join(['browser_test',
         api.platform.normalize_platform_name(api.platform.name)])
-    args = cmd_args
+    args = list(cmd_args)
     path = api.path['checkout'].join(
         'webkit', 'tools', 'layout_tests', 'run_webkit_tests.py')
     args.extend(['--platform', platform_arg])