Modern Chrome Interface for Windows XP?

If you are on Windows XP and Chrome 49, You have to enable these flags to have the Material Design feel!

Flags listed here:
Material design in the browser's top chrome - Material
Extension toolbar redesign - Enabled
Enable Material Design downloads - Enabled
Enable Material Design extensions - Enabled

There is the result of Chrome 49 with Material features enabled (Windows XP).

Chrome 49 with Material Design UI enabled

Chrome 49 with Material Design UI and any theme

Also, you can override the user agent string to the current version of Chrome (link here: User-Agent Switcher and Manager).

If you are on YouTube, The layout site goes blank. So there is a way to fix this.
Tampermonkey: Install from Chrome Web Store
YouTube - Restore Classic: Install from Script here

Other than that, Some other Chromium-based browsers were based on v49 and v50, I tested Slimjet 10 on XP...

Slimjet 10 with Material Design UI Flag enabled

And also, It works on any Windows versions such as XP, Vista, 7, 8.x, 10, and Linux of course...