chromiumBeta: Fix the patch phase

Upstream dropped use_system_libwayland and related build arguments [0].
The deprecation is tracked in [1].
As a result, we must now build with third_party/wayland instead of
wayland from the system (or complex patches would be required).

This fixes [2].

[0]: https://source.chromium.org/chromium/chromium/src/+/1c3c8db518f78cb2d08a3990e5280e324c4a6e99
[1]: https://bugs.chromium.org/p/chromium/issues/detail?id=1385736
[2]: NixOS#213862 (comment)

(cherry picked from commit 26aadca)

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

@@ -260,8 +260,6 @@ let
       host_toolchain = "//build/toolchain/linux/unbundle:default";
       # Don't build against a sysroot image downloaded from Cloud Storage:
       use_sysroot = false;
-      # The default value is hardcoded instead of using pkg-config:
-      system_wayland_scanner_path = "${wayland.bin}/bin/wayland-scanner";
       # Because we use a different toolchain / compiler version:
       treat_warnings_as_errors = false;
       # We aren't compiling with Chrome's Clang (would enable Chrome-specific
@@ -295,12 +293,15 @@ let
       chrome_pgo_phase = 0;
       clang_base_path = "${llvmPackages.clang}";
       use_qt = false;
+    } // lib.optionalAttrs (!chromiumVersionAtLeast "110") {
       # The default has changed to false. We'll build with libwayland from
       # Nixpkgs for now but might want to eventually use the bundled libwayland
       # as well to avoid incompatibilities (if this continues to be a problem
       # from time to time):
       use_system_libwayland = true;
-    } // optionalAttrs proprietaryCodecs {
+      # The default value is hardcoded instead of using pkg-config:
+      system_wayland_scanner_path = "${wayland.bin}/bin/wayland-scanner";
+    } // lib.optionalAttrs proprietaryCodecs {
       # enable support for the H.264 codec
       proprietary_codecs = true;
       enable_hangout_services_extension = true;