Turn on better popup blocker by default.

chrome/browser/ui/browser_tab_contents.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/browser_tab_contents.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api.h"
@@ skipping 119 matching lines @@
   HistoryTabHelper::CreateForWebContents(web_contents);
   HungPluginTabHelper::CreateForWebContents(web_contents);
   InfoBarService::CreateForWebContents(web_contents);
   NavigationMetricsRecorder::CreateForWebContents(web_contents);
   PasswordGenerationManager::CreateForWebContents(web_contents);
   PasswordManagerDelegateImpl::CreateForWebContents(web_contents);
   PasswordManager::CreateForWebContentsAndDelegate(
       web_contents, PasswordManagerDelegateImpl::FromWebContents(web_contents));
   PDFTabHelper::CreateForWebContents(web_contents);
   PluginObserver::CreateForWebContents(web_contents);
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableBetterPopupBlocking)) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableBetterPopupBlocking)) {
     PopupBlockerTabHelper::CreateForWebContents(web_contents);
   }
   PrefsTabHelper::CreateForWebContents(web_contents);
   prerender::PrerenderTabHelper::CreateForWebContents(web_contents);
   SadTabHelper::CreateForWebContents(web_contents);
   safe_browsing::SafeBrowsingTabObserver::CreateForWebContents(web_contents);
   SearchEngineTabHelper::CreateForWebContents(web_contents);
   SearchTabHelper::CreateForWebContents(web_contents);
   SSLTabHelper::CreateForWebContents(web_contents);
   TabContentsSyncedTabDelegate::CreateForWebContents(web_contents);
@@ skipping 27 matching lines @@
                                      std::string(),
                                      NULL)) {
     OneClickSigninHelper::CreateForWebContents(web_contents);
   }
 #endif
 
 #if defined(OS_WIN)
   MetroPinTabHelper::CreateForWebContents(web_contents);
 #endif
 }