Cleanup machine based on the state in configuration file for mini installer test.

chrome/test/mini_installer/verifier.py

Index: chrome/test/mini_installer/verifier.py
diff --git a/chrome/test/mini_installer/verifier.py b/chrome/test/mini_installer/verifier.py
index 053096b4a807805a8f8d90a0445900cdb1ac5c6c..5ca22650682f61de5b0efe1c2a92678e56edbb11 100644
--- a/chrome/test/mini_installer/verifier.py
+++ b/chrome/test/mini_installer/verifier.py
@@ -50,3 +50,12 @@ class Verifier:
       The result of the evaluated condition.
     """
     return eval(condition, {'__builtins__': {'False': False, 'True': True}})
+
+  def _Assert(self, is_true, message):
+    """ Check whether the test result equals to the expectation.
+
+        Args:
+          is_true: A boolean represents whether the assert is success.
+          message: The error message if assert failed.
+    """
+    assert is_true, message