cros_build_lib.run: clean up error_code_ok->check migration

BUG=chromium:1006587
TEST=`./run_tests` passes

Change-Id: Ie416c5f7b16314a34a3a53f503469b3cc93fb9e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1965957
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
diff --git a/scripts/deploy_chrome_unittest.py b/scripts/deploy_chrome_unittest.py
index b7f41c8..2382d18 100644
--- a/scripts/deploy_chrome_unittest.py
+++ b/scripts/deploy_chrome_unittest.py
@@ -201,9 +201,9 @@
     self.assertTrue(self.deploy._root_dir_is_still_readonly.is_set())
 
   def testMountRwFailure(self):
-    """Test that mount failure raises an exception if error_code_ok=False."""
+    """Test that mount failure raises an exception if check=True."""
     self.assertRaises(cros_build_lib.RunCommandError,
-                      self.deploy._MountRootfsAsWritable, error_code_ok=False)
+                      self.deploy._MountRootfsAsWritable, check=True)
     self.assertFalse(self.deploy._root_dir_is_still_readonly.is_set())
 
   def testMountTempDir(self):