Show "Update Chrome OS" in the wrench menu, when the update image is ready.

chrome/browser/views/frame/browser_view.cc

 // Copyright (c) 2010 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/views/frame/browser_view.h"
 
 #if defined(OS_LINUX)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 1050 matching lines @@
 void BrowserView::ToggleBookmarkBar() {
   bookmark_utils::ToggleWhenVisible(browser_->profile());
 }
 
 views::Window* BrowserView::ShowAboutChromeDialog() {
   return browser::ShowAboutChromeView(GetWindow()->GetNativeWindow(),
                                       browser_->profile());
 }
 
 void BrowserView::ShowUpdateChromeDialog() {
-#if defined(OS_WIN)
   UpdateRecommendedMessageBox::ShowMessageBox(GetWindow()->GetNativeWindow());
-#endif
 }
 
 void BrowserView::ShowTaskManager() {
   browser::ShowTaskManager();
 }
 
 void BrowserView::ShowBookmarkBubble(const GURL& url, bool already_bookmarked) {
   toolbar_->location_bar()->ShowStarBubble(url, !already_bookmarked);
 }
 
@@ skipping 1385 matching lines @@
       SetAccessibleName(l10n_util::GetString(IDS_PRODUCT_NAME));
 
   return view;
 }
 #endif
 
 // static
 FindBar* BrowserWindow::CreateFindBar(Browser* browser) {
   return browser::CreateFindBar(static_cast<BrowserView*>(browser->window()));
 }