[cros] disable GDrive option on certain file pickers

chrome/browser/download/save_package_file_picker_chromeos.cc

Index: chrome/browser/download/save_package_file_picker_chromeos.cc
diff --git a/chrome/browser/download/save_package_file_picker_chromeos.cc b/chrome/browser/download/save_package_file_picker_chromeos.cc
index 4cea1980fefb2a832ee5e8023010562b7dd0df7d..a7bae503eb20da9215a6eb0cd9030a380e1b156c 100644
--- a/chrome/browser/download/save_package_file_picker_chromeos.cc
+++ b/chrome/browser/download/save_package_file_picker_chromeos.cc
@@ -45,10 +45,12 @@ SavePackageFilePickerChromeOS::SavePackageFilePickerChromeOS(
   if (g_should_prompt_for_filename) {
     select_file_dialog_ = ui::SelectFileDialog::Create(
         this, new ChromeSelectFilePolicy(web_contents));
+    ui::SelectFileDialog::FileTypeInfo file_types;
+    file_types.support_gdata = true;
     select_file_dialog_->SelectFile(ui::SelectFileDialog::SELECT_SAVEAS_FILE,
                                     string16(),
                                     suggested_path.ReplaceExtension("mhtml"),
-                                    NULL,
+                                    &file_types,
                                     0,
                                     "mhtml",
                                     platform_util::GetTopLevel(