Dont' want to quit the message loop.
Remove AppGetBrowser(). There can be more than one.
Remove the main browser provider. Not used.
Only initialise the client handler once.
Remove m_Browser, m_BrowserId and m_bIsClosing.
Must use the browser from the frame in the context, not the one in the context.
Might not have a client.
Check value.
Better handling of the CefBrowser <-> ofxCEFBrowser relationship.
Change from one global myClientHandler to every ofxCEFBrowser having it's own ClientHandler.
Expose client handler list.
Close all browsers for all clients on shutdown.