Adding switch_to_parent_frame so that it can actually be called

Author: AutomatedTester

py/selenium/webdriver/remote/webdriver.py

@@ -518,6 +518,9 @@ def switch_to_alert(self):
         warnings.warn("use driver.switch_to.alert instead", DeprecationWarning)
         return self._switch_to.alert
 
+    def switch_to_parent_frame(self):
+        self._switch_to.parent_frame
+
     #Navigation
     def back(self):
         """