Start consolidating cross-port file selection code into ui/base/dialogs.

chrome/browser/download/save_package_file_picker.cc

Index: chrome/browser/download/save_package_file_picker.cc
diff --git a/chrome/browser/download/save_package_file_picker.cc b/chrome/browser/download/save_package_file_picker.cc
index cf502914f9eb5121c59d5dfa688a0d96b688b1f8..2e105cd034ae56e1418b8b4f9ab05b66f5bc0790 100644
--- a/chrome/browser/download/save_package_file_picker.cc
+++ b/chrome/browser/download/save_package_file_picker.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/chrome_select_file_policy.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/download_manager.h"
@@ -156,14 +157,14 @@ SavePackageFilePicker::SavePackageFilePicker(
   }
 
   if (g_should_prompt_for_filename) {
-    select_file_dialog_ = SelectFileDialog::Create(this);
+    select_file_dialog_ = SelectFileDialog::Create(
+        this, new ChromeSelectFilePolicy(web_contents));
     select_file_dialog_->SelectFile(SelectFileDialog::SELECT_SAVEAS_FILE,
                                     string16(),
                                     suggested_path,
                                     &file_type_info,
                                     file_type_index,
                                     default_extension,
-                                    web_contents,
                                     platform_util::GetTopLevel(
                                         web_contents->GetNativeView()),
                                     NULL);