libgtk2ui should only add the cups config if use_cups is true

chrome/browser/ui/libgtk2ui/BUILD.gn

Index: chrome/browser/ui/libgtk2ui/BUILD.gn
diff --git a/chrome/browser/ui/libgtk2ui/BUILD.gn b/chrome/browser/ui/libgtk2ui/BUILD.gn
index b85f67d988321d338ec7b8ed986d1b573c21e7e0..595d381887ca2f77ead3fc8e6b84e1bd22e27198 100644
--- a/chrome/browser/ui/libgtk2ui/BUILD.gn
+++ b/chrome/browser/ui/libgtk2ui/BUILD.gn
@@ -65,9 +65,14 @@ component("libgtk2ui") {
 
   configs += [
     "//build/config/linux:gconf",
-    "//printing:cups",
   ]
 
+  if (use_cups) {
+    configs += [
+      "//printing:cups",
+    ]
+  }
+
   # GTK2 pulls pangoft2 as dependency, and pangoft2 depends on harfbuzz.
   # To avoid missing indirectly referenced harfbuzz symbols from pango,
   # some hack is required when bundled harfbuzz is used and component build is