Cleanup: Rename two entries of 'direct_dependent_configs' to 'public_configs'.

public_configs is the non-deprecated name of direct_dependent_configs.

BUG=None
TEST=gn gen out-gn
R=brettw@chromium.org

Review URL: https://codereview.chromium.org/1034063002

Cr-Commit-Position: refs/heads/master@{#322363}

build/config/linux/gtk/BUILD.gn

@@ -28,7 +28,7 @@ group("gtk") {
     "//chrome/browser/ui/libgtk2ui",
     "//remoting/host",
   ]
-  direct_dependent_configs = [ ":gtk_internal_config" ]
+  public_configs = [ ":gtk_internal_config" ]
 }
 
 # Depend on "gtkprint" to get this.
@@ -38,5 +38,5 @@ pkg_config("gtkprint_internal_config") {
 
 group("gtkprint") {
   visibility = [ "//chrome/browser/ui/libgtk2ui" ]
-  direct_dependent_configs = [ ":gtkprint_internal_config" ]
+  public_configs = [ ":gtkprint_internal_config" ]
 }