First attempt at cleaning up chrome_resources.gyp.

tools/gn/secondary/chrome/BUILD.gn

Index: tools/gn/secondary/chrome/BUILD.gn
diff --git a/tools/gn/secondary/chrome/BUILD.gn b/tools/gn/secondary/chrome/BUILD.gn
index 96c9f55117a47a1196d2cbc493391916e951454d..c9a727895642c77e9267d97a8eca3bf7ed2d4e1a 100644
--- a/tools/gn/secondary/chrome/BUILD.gn
+++ b/tools/gn/secondary/chrome/BUILD.gn
@@ -286,15 +286,8 @@ action("about_credits") {
 #  source = "browser/resources/translate_internals_resources.grd"
 #}
 #
-#group("theme_resources") {
-#  deps = [
-#    ":theme_resources_gen",
-#    #"//ui:ui_resources",
-#  ]
-#}
-#
 ## TODO(brettw) rename "app_theme_resources" or something when we don't support
 ## GYP any more. This name is required to match the GYP build.
-#grit("theme_resources_gen") {
+#grit("theme_resources") {
 #  source = "app/theme/theme_resources.grd"
 #}