google Default Client Secret
Returns an Optional
that contains a string representing the Google client secret or an empty Optional
if the Google client secret was not set.
Some Chromium features such as Geolocation, Spelling, Speech, etc. use Google APIs, and to access those APIs, an API Key, OAuth 2.0 client ID, and client secret are required. Setting up API keys is optional. If you do not do it, the specific APIs using Google services won't work.