Move command handling and updating off Browser and onto a helper object.

chrome/browser/tab_restore_browsertest.cc

 // Copyright (c) 2012 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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
@@ skipping 239 matching lines @@
 
   // Close one of them.
   CloseTab(0);
   ASSERT_EQ(browser()->tab_count(), starting_tab_count + 1);
 
   // Restore it.
   ASSERT_NO_FATAL_FAILURE(RestoreTab(0, 0));
   ASSERT_EQ(browser()->tab_count(), starting_tab_count + 2);
 
   // Make sure that there's nothing else to restore.
-  ASSERT_FALSE(browser()->command_updater()->IsCommandEnabled(IDC_RESTORE_TAB));
+  ASSERT_FALSE(chrome::CanRestoreTab(browser()));
 }
 
 // Open a window with multiple tabs, close a tab, then close the window.
 // Restore both and make sure the tab goes back into the window.
 IN_PROC_BROWSER_TEST_F(TabRestoreTest, RestoreWindowAndTab) {
   int starting_tab_count = browser()->tab_count();
   AddSomeTabs(browser(), 3);
 
   // Close one in the middle
   int closed_tab_index = starting_tab_count + 1;
@@ skipping 263 matching lines @@
   TabContents* tab = browser()->GetTabContentsAt(1);
   EnsureTabFinishedRestoring(tab->web_contents());
   ASSERT_EQ(http_url, tab->web_contents()->GetURL());
 
   // Go back, and see if content is as expected.
   GoBack(browser());
   EXPECT_GT(
       ui_test_utils::FindInPage(tab, ASCIIToUTF16("webkit"), true, false, NULL),
       0);
 }