disable [add folder] button for media galleries dialog if

chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc

Index: chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc
diff --git a/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc b/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc
index 16fbec63a6b0f3a17daeda5022787bce7c689cdb..89a81bcb50cfeadc96e9cb09324fe71935b0978f 100644
--- a/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc
+++ b/chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc
@@ -7,6 +7,7 @@
 #include "base/auto_reset.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/media_gallery/media_galleries_preferences.h"
+#include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 #include "grit/generated_resources.h"
 #include "ui/base/gtk/gtk_hig_constants.h"
@@ -68,10 +69,12 @@ void MediaGalleriesDialogGtk::InitWidgets() {
   gtk_box_pack_start(GTK_BOX(contents_.get()), bottom_area, FALSE, FALSE, 0);
 
   // Add gallery button.
-  GtkWidget* add_folder = gtk_button_new_with_label(
-      l10n_util::GetStringUTF8(IDS_MEDIA_GALLERIES_DIALOG_ADD_GALLERY).c_str());
-  g_signal_connect(add_folder, "clicked", G_CALLBACK(OnAddFolderThunk), this);
-  gtk_box_pack_start(GTK_BOX(bottom_area), add_folder, FALSE, FALSE, 0);
+  if (ChromeSelectFilePolicy::FileSelectDialogsAllowed()) {
+    GtkWidget* add_folder = gtk_button_new_with_label(l10n_util::GetStringUTF8(
+        IDS_MEDIA_GALLERIES_DIALOG_ADD_GALLERY).c_str());
+    g_signal_connect(add_folder, "clicked", G_CALLBACK(OnAddFolderThunk), this);
+    gtk_box_pack_start(GTK_BOX(bottom_area), add_folder, FALSE, FALSE, 0);
+  }
 
   // Confirm/cancel button.
   confirm_ = gtk_button_new_with_label(l10n_util::GetStringUTF8(