chromium, electron: use override instead of overrideAttrs for gn

Co-authored-by: emilylange <[e-mail]>
Signed-off-by: Marcin Serwin <[e-mail]>

pkgs/applications/networking/browsers/chromium/default.nix

···
         pulseSupport
         ungoogled
         ;
-      gnChromium = buildPackages.gn.overrideAttrs (oldAttrs: {
-        version = if (upstream-info.deps.gn ? "version") then upstream-info.deps.gn.version else "0";
-        src = fetchgit {
-          url = "https://gn.googlesource.com/gn";
-          inherit (upstream-info.deps.gn) rev hash;
-        };
-      });
+      gnChromium = buildPackages.gn.override upstream-info.deps.gn;
     });
 
     browser = callPackage ./browser.nix {

pkgs/applications/networking/browsers/chromium/info.json

···
         "hash": "sha256-UouvzNFStYScnyfIJcz1Om7cDhC7EyShZQ/Icu73BPo="
       },
       "gn": {
+        "version": "0-unstable-2025-06-19",
         "rev": "97b68a0bb62b7528bc3491c7949d6804223c2b82",
-        "hash": "sha256-m+z10s40Q/iYcoMw3o/+tmhIdqHMsYJjdGabHrK/aqo="
+        "hash": "sha256-gwptzuirIdPAV9XCaAT09aM/fY7d6xgBU7oSu9C4tmE="
       },
       "npmHash": "sha256-R2gOpfPOUAmnsnUTIvzDPHuHNzL/b2fwlyyfTrywEcI="
     },
···
         "hash": "sha256-UouvzNFStYScnyfIJcz1Om7cDhC7EyShZQ/Icu73BPo="
       },
       "gn": {
+        "version": "0-unstable-2025-06-19",
         "rev": "97b68a0bb62b7528bc3491c7949d6804223c2b82",
-        "hash": "sha256-m+z10s40Q/iYcoMw3o/+tmhIdqHMsYJjdGabHrK/aqo="
+        "hash": "sha256-gwptzuirIdPAV9XCaAT09aM/fY7d6xgBU7oSu9C4tmE="
       },
       "ungoogled-patches": {
         "rev": "139.0.7258.66-1",

pkgs/development/tools/electron/info.json

···
         "chromium": {
             "deps": {
                 "gn": {
-                    "hash": "sha256-EqbwCLkseND1v3UqM+49N7GuoXJ3PlJjWOes4OijQ3U=",
+                    "hash": "sha256-U0f/Q134UJrSke+/o9Hs4+mQa/vSM2hdkRXhLfhnqME=",
                     "rev": "ed1abc107815210dc66ec439542bee2f6cbabc00",
-                    "url": "https://gn.googlesource.com/gn",
-                    "version": "2025-01-13"
+                    "version": "0-unstable-2025-01-13"
                 }
             },
             "version": "134.0.6998.205"
···
         "chromium": {
             "deps": {
                 "gn": {
-                    "hash": "sha256-vDKMt23RMDI+KX6CmjfeOhRv2haf/mDOuHpWKnlODcg=",
+                    "hash": "sha256-MnGl+D9ahQibUHCtyOUf1snvmeupUn4D2yrDj55JTe4=",
                     "rev": "6e8e0d6d4a151ab2ed9b4a35366e630c55888444",
-                    "url": "https://gn.googlesource.com/gn",
-                    "version": "2025-03-24"
+                    "version": "0-unstable-2025-03-24"
                 }
             },
             "version": "136.0.7103.177"
···
         "chromium": {
             "deps": {
                 "gn": {
-                    "hash": "sha256-UB9a7Fr1W0yYld6WbXyRR8dFqWsj/zx4KumDZ5JQKSM=",
+                    "hash": "sha256-BplU8qNKObVrKMLKTyqivPF1L6bbJulFC+Zop9UpmZY=",
                     "rev": "ebc8f16ca7b0d36a3e532ee90896f9eb48e5423b",
-                    "url": "https://gn.googlesource.com/gn",
-                    "version": "2025-05-21"
+                    "version": "0-unstable-2025-05-21"
                 }
             },
             "version": "138.0.7204.185"