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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def copy_user_agent_from_driver(self):
 """ Updates requests' session user-agent with the driver's user agent This method will start the browser process if its not already running. """

        selenium_user_agent = self.driver.execute_script("return navigator.userAgent;")
        self.headers.update({"user-agent": selenium_user_agent})