make use of existing gn args in net/BUILD.gn

BUG=632297

Review-Url: https://codereview.chromium.org/2188043002
Cr-Commit-Position: refs/heads/master@{#409209}
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 7df216de..91bb4de7 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -195,7 +195,7 @@
       ]
     }
 
-    if (use_glib && use_gconf && !is_chromeos) {
+    if (use_gio) {
       deps += [ "//build/linux/libgio" ]
     }
 
@@ -977,7 +977,7 @@
         "//build/win:default_exe_manifest",
       ]
 
-      if (is_desktop_linux && use_gconf && use_glib) {
+      if (is_desktop_linux && use_gconf && use_glib && use_gio) {
         configs += [
           "//build/config/linux/gconf",
           "//build/config/linux:glib",