Set the value associated with preference name. If value is null the
preference will be restored to its default value. If setting the preference
fails then error will be populated with a detailed description of the
problem. This method must be called on the CEF UI thread.
Preferences set via the command-line usually cannot be modified.
CefSharp.Core (in CefSharp.Core.dll) Version: 22.214.171.124
Use Cef.UIThreadTaskFactory to execute this method if required,
and ChromiumWebBrowser.IsBrowserInitializedChanged are both
executed on the CEF UI thread, so can be called directly.
When CefSettings.MultiThreadedMessageLoop == false (the default is true) then the main
application thread will be the CEF UI thread.