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To test use 'cefsimple --mus --use-views --url=<url>'

Note that the CEF path not using ui::views/aura doesn't work (
see tests/cefsimple/simple_app.cc)

Disable X11 code, remove cefclient from build to remove gtk dependency.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

Windows: Build cef_sandbox.lib with different GN args for official binary distributions (issue #2220)

- CefLifeSpanHandler::OnBeforePopup is now called on the UI thread.
- Remove CefBrowserSettings.javascript_open_windows which is no
  longer supported.

- Add new CefBrowserHost::SetAccessibilityState method for toggling
  accessibility state when readers are detected by the client.
- Add new CefAccessibilityHandler interface for the delivery of
  accessibility notifications to windowless (OSR) clients.
- Fix delivery of CefFocusHandler callbacks to windowless clients.
- cefclient: Add example windowless accessibility implementation on Windows and macOS.
- cefclient: Automatically detect screen readers on Windows and macOS.