The latest update coming to Chrome 51 will allow you to Cast the browser to your TV or another Cast-supported monitor without having to use the Google Cast extension. The update bakes the functionality into the browser and it has an option you can select from the tool menu. You can even right click on browser to Cast a specific page.
This new Cast feature will take out the ability to determine bitrate, video quality, and resolution since it’ll automatically adjust this for you depending on your bandwidth. The existing extension won’t go anywhere though, this just gives you the ability to Cast much faster. The update is rolling out to users in the coming weeks.
Source: The Verge