Unfortunately I've had that problem with a lot of cross-platform software on Linux lately. Chrome, for instance, doesn't seem to be made with the idea in mind that people might use window managers other than Gnome, or might have settings other than the default chosen for certain behaviors. For instance, double clicking the title bar maximizes the Chrome window - though I have that set to a shade action. There are a few other issues, too, so it's not surprising to me that there are problems with a WM they've probably never tested such as xmonad.

That sounds like fun with Chrome's window-manager emulation. It behaves a lot more respectably when you go Settings → Personal Stuff → Appearance and choose "Use system title bar and borders".

I've tried that too earlier, but it seemed to trigger a couple of other bugs - getting the mouse 'stuck' on the title area, for one. This was many months ago, so I wouldn't be surprised if it's totally fixed by now.