linux and chromeos: Turn on -Wunused-const-variable.

chrome/browser/ui/views/frame/global_menu_bar_x11.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 "chrome/browser/ui/views/frame/global_menu_bar_x11.h"
 
 #include <dlfcn.h>
 #include <glib-object.h>
 
 #include "base/logging.h"
@@ skipping 109 matching lines @@
 const unsigned int kRecentlyClosedCount = 8;
 
 // Menus more than this many chars long will get trimmed.
 const int kMaximumMenuWidthInChars = 50;
 
 // Constants used in menu definitions.
 const int MENU_SEPARATOR =-1;
 const int MENU_END = -2;
 const int MENU_DISABLED_ID = -3;
 
-// These tag values are used to refer to menu itesm.
-const int TAG_NORMAL = 0;
+// These tag values are used to refer to menu items.
 const int TAG_MOST_VISITED = 1;
 const int TAG_RECENTLY_CLOSED = 2;
 const int TAG_MOST_VISITED_HEADER = 3;
 const int TAG_RECENTLY_CLOSED_HEADER = 4;
 
 GlobalMenuBarCommand file_menu[] = {
   { IDS_NEW_TAB, IDC_NEW_TAB },
   { IDS_NEW_WINDOW, IDC_NEW_WINDOW },
   { IDS_NEW_INCOGNITO_WINDOW, IDC_NEW_INCOGNITO_WINDOW },
   { IDS_REOPEN_CLOSED_TABS_LINUX, IDC_RESTORE_TAB },
@@ skipping 635 matching lines @@
       tab_restore_service_->LoadTabsFromLastSession();
       tab_restore_service_->AddObserver(this);
 
       // If LoadTabsFromLastSession doesn't load tabs, it won't call
       // TabRestoreServiceChanged(). This ensures that all new windows after
       // the first one will have their menus populated correctly.
       TabRestoreServiceChanged(tab_restore_service_);
     }
   }
 }