Removes webdirvercache.py from utils (#1048)

Author: aaltat

src/SeleniumLibrary/utils/__init__.py

@@ -20,7 +20,6 @@
 from .librarylistener import LibraryListener
 from .seleniumversion import SELENIUM_VERSION
 from .types import is_falsy, is_noney, is_string, is_truthy
-from .webdrivercache import WebDriverCache
 
 
 def escape_xpath_value(value):