electron-source.electron_31: remove as it's EOL

https://github.com/electron/electron/blob/2745771a22dc7aec4364fec758804e0b7f230357/docs/tutorial/electron-timelines.md

Ref: aa01edd
(cherry picked from commit cd1c17d)

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

@@ -456,32 +456,6 @@ let
         # flag (declare_args) so we simply hardcode it to false.
         ./patches/widevine-disable-auto-download-allow-bundle.patch
       ]
-      ++ lib.optionals (versionRange "127" "128") [
-        # Fix missing chrome/browser/ui/webui_name_variants.h dependency
-        # and ninja 1.12 compat in M127.
-        # https://issues.chromium.org/issues/345645751
-        # https://issues.chromium.org/issues/40253918
-        # https://chromium-review.googlesource.com/c/chromium/src/+/5641516
-        (githubPatch {
-          commit = "2c101186b60ed50f2ba4feaa2e963bd841bcca47";
-          hash = "sha256-luu3ggo6XoeeECld1cKZ6Eh8x/qQYmmKI/ThEhuutuY=";
-        })
-        # https://chromium-review.googlesource.com/c/chromium/src/+/5644627
-        (githubPatch {
-          commit = "f2b43c18b8ecfc3ddc49c42c062d796c8b563984";
-          hash = "sha256-uxXxSsiS8R0827Oi3xsG2gtT0X+jJXziwZ1y8+7K+Qg=";
-        })
-        # https://chromium-review.googlesource.com/c/chromium/src/+/5646245
-        (githubPatch {
-          commit = "4ca70656fde83d2db6ed5a8ac9ec9e7443846924";
-          hash = "sha256-iQuRRZjDDtJfr+B7MV+TvUDDX3bvpCnv8OpSLJ1WqCE=";
-        })
-        # https://chromium-review.googlesource.com/c/chromium/src/+/5647662
-        (githubPatch {
-          commit = "50d63ffee3f7f1b1b9303363742ad8ebbfec31fa";
-          hash = "sha256-H+dv+lgXSdry3NkygpbCdTAWWdTVdKdVD3Aa62w091E=";
-        })
-      ]
       ++ [
         # Required to fix the build with a more recent wayland-protocols version
         # (we currently package 1.26 in Nixpkgs while Chromium bundles 1.21):
@@ -644,7 +618,7 @@ let
       + ''
         # Link to our own Node.js and Java (required during the build):
         mkdir -p third_party/node/linux/node-linux-x64/bin
-        ln -s${lib.optionalString (chromiumVersionAtLeast "127") "f"} "${pkgsBuildHost.nodejs}/bin/node" third_party/node/linux/node-linux-x64/bin/node
+        ln -sf "${pkgsBuildHost.nodejs}/bin/node" third_party/node/linux/node-linux-x64/bin/node
         ln -s "${pkgsBuildHost.jdk17_headless}/bin/java" third_party/jdk/current/bin/
 
         # Allow building against system libraries in official builds
@@ -749,8 +723,6 @@ let
         use_system_libffi = true;
         # Use nixpkgs Rust compiler instead of the one shipped by Chromium.
         rust_sysroot_absolute = "${buildPackages.rustc}";
-      }
-      // lib.optionalAttrs (chromiumVersionAtLeast "127") {
         rust_bindgen_root = "${buildPackages.rust-bindgen}";
       }
       // {

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

@@ -90,8 +90,7 @@ let
               url = "https://gn.googlesource.com/gn";
               inherit (upstream-info.deps.gn) rev hash;
             };
-          }
-          // lib.optionalAttrs (chromiumVersionAtLeast "127") {
+
             # Relax hardening as otherwise gn unstable 2024-06-06 and later fail with:
             # cc1plus: error: '-Wformat-security' ignored without '-Wformat' [-Werror=format-security]
             hardeningDisable = [ "format" ];