🐳 Move linux pkg_config() calls into separate BUILD.gn files

chrome/browser/ui/libgtk2ui/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 assert(is_linux, "This file should only be referenced on Linux")
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 # gn orders flags on a target before flags from configs. The default config
@@ skipping 52 matching lines @@
     "unity_service.h",
     "x11_input_method_context_impl_gtk2.cc",
     "x11_input_method_context_impl_gtk2.h",
   ]
 
   if (use_gconf) {
     sources += [
       "gconf_listener.cc",
       "gconf_listener.h",
     ]
-    configs += [ "//build/config/linux:gconf" ]
+    configs += [ "//build/config/linux/gconf" ]
   }
   defines = [ "LIBGTK2UI_IMPLEMENTATION" ]
 
   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
@@ skipping 39 matching lines @@
       "//build/config/linux/gtk3",
       "//build/config/linux/gtk3:gtkprint3",
     ]
   } else {
     deps += [
       "//build/config/linux/gtk2",
       "//build/config/linux/gtk2:gtkprint2",
     ]
   }
 }