I created an account just to share this. Sorry to bring up an old thread but I had the same problem and found the solution. Hopefully this can help someone else.
For me the solution was to go to chrome://flags/ and press Ctrl+F (probably option+F on a mac) and search for Force Color Profile. I changed mine from default to sRGB and now FINALLY my 4k files look like 1080 files. I was getting the same muddy magenta cast to my 4k output files when viewed in chrome. Not anymore.