Open harness web page.

        Open a quiet chrome which:
        1. disables extensions,
        2. ignore certificate errors and
        3. always allow notifications.

def _init_browser(self):
        """Open harness web page.

        Open a quiet chrome which:
        1. disables extensions,
        2. ignore certificate errors and
        3. always allow notifications.
        """
        chrome_options = webdriver.ChromeOptions()
        chrome_options.add_argument('--disable-extensions')
        chrome_options.add_argument('--disable-infobars')
        chrome_options.add_argument('--ignore-certificate-errors')
        chrome_options.add_experimental_option('prefs', {
            'profile.managed_default_content_settings.notifications': 1
        })

        browser = webdriver.Chrome(chrome_options=chrome_options)
        browser.set_page_load_timeout(10)
        browser.implicitly_wait(1)
        browser.maximize_window()
        browser.get(settings.HARNESS_URL)
        self._browser = browser
        if not wait_until(lambda: 'Thread' in browser.title, 30):
            self.assertIn('Thread', browser.title)