chromium: remove "channel" argument

This is no longer used as we only differentiate between stable and
ungoogled-chromium, which we already track in the "ungoogled" boolean.

Beta and dev channels are gone for good.
It's been a year since their removal in 59719f787e.

There is, however, an additional channel mapping in nixos/tests/chromium
but that one is independent from this one here.

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

@@ -1,5 +1,5 @@
 { lib, mkChromiumDerivation
-, channel, chromiumVersionAtLeast
+, chromiumVersionAtLeast
 , enableWideVine, ungoogled
 }:
 
@@ -90,7 +90,7 @@ mkChromiumDerivation (base: rec {
     license = if enableWideVine then lib.licenses.unfree else lib.licenses.bsd3;
     platforms = lib.platforms.linux;
     mainProgram = "chromium";
-    hydraPlatforms = lib.optionals (channel == "stable" || channel == "ungoogled-chromium") ["aarch64-linux" "x86_64-linux"];
+    hydraPlatforms = ["aarch64-linux" "x86_64-linux"];
     timeout = 172800; # 48 hours (increased from the Hydra default of 10h)
   };
 })

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

@@ -3,7 +3,7 @@
 , buildPackages
 , pkgsBuildBuild
 # Channel data:
-, channel, upstream-info
+, upstream-info
 # Helper functions:
 , chromiumVersionAtLeast, versionRange
 

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

@@ -10,8 +10,7 @@
 
 # package customization
 # Note: enable* flags should not require full rebuilds (i.e. only affect the wrapper)
-, channel ? "stable"
-, upstream-info ? (import ./upstream-info.nix).${channel}
+, upstream-info ? (import ./upstream-info.nix).${if !ungoogled then "stable" else "ungoogled-chromium"}
 , proprietaryCodecs ? true
 , enableWideVine ? false
 , ungoogled ? false # Whether to build chromium or ungoogled-chromium
@@ -46,7 +45,7 @@ let
     inherit stdenv upstream-info;
 
     mkChromiumDerivation = callPackage ./common.nix ({
-      inherit channel chromiumVersionAtLeast versionRange;
+      inherit chromiumVersionAtLeast versionRange;
       inherit proprietaryCodecs
               cupsSupport pulseSupport ungoogled;
       gnChromium = buildPackages.gn.overrideAttrs (oldAttrs: {
@@ -69,7 +68,7 @@ let
     });
 
     browser = callPackage ./browser.nix {
-      inherit channel chromiumVersionAtLeast enableWideVine ungoogled;
+      inherit chromiumVersionAtLeast enableWideVine ungoogled;
     };
 
     # ungoogled-chromium is, contrary to its name, not a build of
@@ -80,8 +79,6 @@ let
     ungoogled-chromium = pkgsBuildBuild.callPackage ./ungoogled.nix {};
   };
 
-  suffix = lib.optionalString (channel != "stable" && channel != "ungoogled-chromium") ("-" + channel);
-
   sandboxExecutableName = chromium.browser.passthru.sandboxExecutableName;
 
   # We want users to be able to enableWideVine without rebuilding all of
@@ -99,7 +96,7 @@ let
 
 in stdenv.mkDerivation {
   pname = lib.optionalString ungoogled "ungoogled-"
-    + "chromium${suffix}";
+    + "chromium";
   inherit (chromium.browser) version;
 
   nativeBuildInputs = [

pkgs/top-level/all-packages.nix

@@ -16246,7 +16246,6 @@ with pkgs;
 
   ungoogled-chromium = callPackage ../applications/networking/browsers/chromium ((config.chromium or {}) // {
     ungoogled = true;
-    channel = "ungoogled-chromium";
   });
 
   unigine-tropics = pkgsi686Linux.callPackage ../applications/graphics/unigine-tropics { };