Revert "Using new Service object instead of deprecated execution_path"

This reverts commit 40bda19.

Author: umihico

main.py

@@ -5,8 +5,6 @@
 
 def handler(event=None, context=None):
     options = webdriver.ChromeOptions()
-    service = webdriver.ChromeService("/opt/chromedriver")
-
     options.binary_location = '/opt/chrome/chrome'
     options.add_argument('--headless')
     options.add_argument('--no-sandbox')
@@ -20,8 +18,7 @@ def handler(event=None, context=None):
     options.add_argument(f"--data-path={mkdtemp()}")
     options.add_argument(f"--disk-cache-dir={mkdtemp()}")
     options.add_argument("--remote-debugging-port=9222")
-
-    chrome = webdriver.Chrome(options=options, service=service)
+    chrome = webdriver.Chrome("/opt/chromedriver",
+                              options=options)
     chrome.get("https://example.com/")
-
     return chrome.find_element(by=By.XPATH, value="//html").text