Componentize sad_tab

chrome/browser/ui/chrome_sad_tab_client_mac.mm

+// 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/ui/chrome_sad_tab_client.h"
+
+#include "chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h"
+
+scoped_ptr<sad_tab::SadTab> ChromeSadTabClient::CreateSadTab(
+    content::WebContents* web_contents,
+    sad_tab::SadTabKind kind) {
+  return scoped_ptr<sad_tab::SadTab>(new chrome::SadTabCocoa(web_contents));
+}