chromium: No GSettings schemas are installed on the system

[NeQuissimus]

Issue description

I think this is similar to #25518

Whenever I try to access the system print dialog or want to upload a file, Chromium crashes on me with the below message.

(chromium:19213): GLib-GIO-ERROR **: No GSettings schemas are installed on the system [1] 19213 trace trap ./result/bin/chromium

I tried to fix this using the solution in #25518 but a Chromium build takes my poor little laptop > 12 hrs and my first two attempts were unsuccessful.

Steps to reproduce

• Start Chromium
• Open some sort of file upload dialog

Technical details

• System: 17.03.1313.d10fe64124
• Nix version: nix-env (Nix) 1.11.10
• Nixpkgs version: "17.03.1298.5bafc71b61"
• Sandboxing enabled: build-use-sandbox = true

[7c6f434c]

You don't need to rebuild Chromium per se, it should be enough to extend the wrapper with

--prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH" \
--suffix XDG_DATA_DIRS : '${gnome3.defaultIconTheme}/share'

[cstrahan]

Fixed in #26614