diff --git a/pkgs/applications/networking/browsers/chromium/common.nix b/pkgs/applications/networking/browsers/chromium/common.nix
index 7803a530a92..dbfd4753416 100644
--- a/pkgs/applications/networking/browsers/chromium/common.nix
+++ b/pkgs/applications/networking/browsers/chromium/common.nix
@@ -22,7 +22,6 @@
 
 # package customization
 , enableNaCl ? false
-, enableHotwording ? false
 , enableWideVine ? false
 , gnomeSupport ? false, gnome ? null
 , gnomeKeyringSupport ? false, libgnome-keyring3 ? null
@@ -215,11 +214,8 @@ let
       proprietary_codecs = false;
       use_sysroot = false;
       use_gnome_keyring = gnomeKeyringSupport;
-      ## FIXME remove use_gconf after chromium 65 has become stable
-      use_gconf = gnomeSupport;
       use_gio = gnomeSupport;
       enable_nacl = enableNaCl;
-      enable_hotwording = enableHotwording;
       enable_widevine = enableWideVine;
       use_cups = cupsSupport;
 
@@ -259,7 +255,10 @@ let
       libExecPath="${libExecPath}"
       python build/linux/unbundle/replace_gn_files.py \
         --system-libraries ${toString gnSystemLibraries}
-      gn gen --args=${escapeShellArg gnFlags} out/Release
+      gn gen --args=${escapeShellArg gnFlags} out/Release | tee gn-gen-outputs.txt
+
+      # Fail if `gn gen` contains a WARNING.
+      grep -o WARNING gn-gen-outputs.txt && echo "Found gn WARNING, exiting nix build" && exit 1
 
       runHook postConfigure
     '';
diff --git a/pkgs/applications/networking/browsers/chromium/default.nix b/pkgs/applications/networking/browsers/chromium/default.nix
index 1458a181656..d2bb0425170 100644
--- a/pkgs/applications/networking/browsers/chromium/default.nix
+++ b/pkgs/applications/networking/browsers/chromium/default.nix
@@ -4,7 +4,6 @@
 # package customization
 , channel ? "stable"
 , enableNaCl ? false
-, enableHotwording ? false
 , gnomeSupport ? false, gnome ? null
 , gnomeKeyringSupport ? false
 , proprietaryCodecs ? true
@@ -22,7 +21,7 @@ let
     upstream-info = (callPackage ./update.nix {}).getChannel channel;
 
     mkChromiumDerivation = callPackage ./common.nix {
-      inherit enableNaCl enableHotwording gnomeSupport gnome
+      inherit enableNaCl gnomeSupport gnome
               gnomeKeyringSupport proprietaryCodecs cupsSupport pulseSupport
               enableWideVine;
     };