Abstract media galleries context menu code and use it in scan result dialog.

chrome/browser/media_galleries/media_gallery_context_menu.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/media_galleries/media_gallery_context_menu.h"
+#include "grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/models/menu_model.h"
+
+MediaGalleryContextMenu::MediaGalleryContextMenu(
+    const ForgetGalleryCallback& callback)
+    : ui::SimpleMenuModel(NULL),
+      callback_(callback) {
+  set_delegate(this);
+  AddItem(1, l10n_util::GetStringUTF16(IDS_MEDIA_GALLERIES_DIALOG_DELETE));
+}
+
+MediaGalleryContextMenu::~MediaGalleryContextMenu() {}
+
+bool MediaGalleryContextMenu::IsCommandIdChecked(int command_id) const {
+  return false;
+}
+
+bool MediaGalleryContextMenu::IsCommandIdEnabled(int command_id) const {
+  return true;
+}
+
+bool MediaGalleryContextMenu::IsCommandIdVisible(int command_id) const {
+  return true;
+}
+
+bool MediaGalleryContextMenu::GetAcceleratorForCommandId(
+    int command_id, ui::Accelerator* accelerator) {
+  return false;
+}
+
+void MediaGalleryContextMenu::ExecuteCommand(int command_id, int event_flags) {
+  callback_.Run(pref_id_);
+}