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

chrome/browser/ui/webui/extensions/extension_settings_handler.cc

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.cc
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
index 1605be8e34c3544b53109b4e68bceeae01e27ec9..5861aa2aef6d331a30aee01298473e8f4580aeb2 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
@@ -14,6 +14,7 @@
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "base/version.h"
+#include "chrome/browser/chrome_select_file_policy.h"
 #include "chrome/browser/debugger/devtools_window.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_disabled_ui.h"
@@ -720,7 +721,9 @@ void ExtensionSettingsHandler::HandleLoadUnpackedExtensionMessage(
   load_extension_dialog_ = SelectFileDialog::Create(this);
   load_extension_dialog_->SelectFile(
       kSelectType, select_title, last_unpacked_directory_, NULL,
-      kFileTypeIndex, FILE_PATH_LITERAL(""), web_ui()->GetWebContents(),
+      kFileTypeIndex, FILE_PATH_LITERAL(""),
+      ChromeSelectFilePolicy::DisplayInfobarCallback(
+          web_ui()->GetWebContents()),
       web_ui()->GetWebContents()->GetView()->GetTopLevelNativeWindow(), NULL);
 }