Move AvatarMenuModel::Item into ui/base.

ui/base/profile_selector/avatar_menu_item_model.cc

+// Copyright 2013 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 "ui/base/profile_selector/avatar_menu_item_model.h"
+
+#include "ui/gfx/image/image.h"
+
+namespace ui {
+
+AvatarMenuItemModel::AvatarMenuItemModel(size_t model_index,
+                                         const gfx::Image& icon)
+    : icon(icon),
+      active(false),
+      signed_in(false),
+      signin_required(false),
+      model_index(model_index) {
+}
+
+AvatarMenuItemModel::~AvatarMenuItemModel() {
+}
+
+}  // namespace ui