Set the directory where disk cache files will be stored
This method must be called before loading anything in this context, otherwise
it will not have any effect.
Note that this method overrides the directory set in the #WebKitWebsiteDataManager,
but it doesn't change the value returned by webkit_website_data_manager_get_disk_cache_directory()
since the #WebKitWebsiteDataManager is immutable.
Set the directory where disk cache files will be stored This method must be called before loading anything in this context, otherwise it will not have any effect.
Note that this method overrides the directory set in the #WebKitWebsiteDataManager, but it doesn't change the value returned by webkit_website_data_manager_get_disk_cache_directory() since the #WebKitWebsiteDataManager is immutable.