Make NTP other sessions menu off disabled by default.

chrome/browser/ui/webui/ntp/ntp_resource_cache.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 "chrome/browser/ui/webui/ntp/ntp_resource_cache.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 379 matching lines @@
   }
 
   // If the user has preferences for a start and end time for a promo from
   // the server, and this promo string exists, set the localized string.
   if (PromoResourceService::CanShowNotificationPromo(profile_)) {
     localized_strings.SetString("serverpromo",
         profile_->GetPrefs()->GetString(prefs::kNtpPromoLine));
   }
 
   // Determine whether to show the menu for accessing tabs on other devices.
-  bool show_other_sessions_menu = !CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableNTPOtherSessionsMenu);
+  bool show_other_sessions_menu = CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableNTPOtherSessionsMenu);
   localized_strings.SetBoolean("showOtherSessionsMenu",
                                show_other_sessions_menu);
 
   // Load the new tab page appropriate for this build
   std::string full_html;
   base::StringPiece new_tab_html(ResourceBundle::GetSharedInstance().
       GetRawDataResource(IDR_NEW_TAB_4_HTML));
   full_html = jstemplate_builder::GetI18nTemplateHtml(new_tab_html,
                                                       &localized_strings);
   new_tab_html_ = base::RefCountedString::TakeString(&full_html);
@@ skipping 118 matching lines @@
   // Get our template.
   static const base::StringPiece new_tab_theme_css(
       ResourceBundle::GetSharedInstance().GetRawDataResource(
           IDR_NEW_TAB_4_THEME_CSS));
 
   // Create the string from our template and the replacements.
   std::string css_string;
   css_string = ReplaceStringPlaceholders(new_tab_theme_css, subst, NULL);
   new_tab_css_ = base::RefCountedString::TakeString(&css_string);
 }