Switch SadTabHelper to use WebContentsUserData.

chrome/browser/ui/tab_contents/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/tab_contents/tab_contents.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "chrome/browser/autofill/autocomplete_history_manager.h"
 #include "chrome/browser/autofill/autofill_external_delegate.h"
@@ skipping 150 matching lines @@
 
 #if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
   captive_portal_tab_helper_.reset(
       new captive_portal::CaptivePortalTabHelper(profile(), web_contents()));
 #endif
 
 #if !defined(OS_ANDROID)
   if (OmniboxSearchHint::IsEnabled(profile()))
     OmniboxSearchHint::CreateForWebContents(contents);
   PDFTabHelper::CreateForWebContents(contents);
-  sad_tab_helper_.reset(new SadTabHelper(contents));
+  SadTabHelper::CreateForWebContents(contents);
   web_intent_picker_controller_.reset(new WebIntentPickerController(this));
 #endif
 
   external_protocol_observer_.reset(new ExternalProtocolObserver(contents));
   navigation_metrics_recorder_.reset(new NavigationMetricsRecorder(contents));
   pepper_broker_observer_.reset(new PepperBrokerObserver(contents));
   plugin_observer_.reset(new PluginObserver(this));
   safe_browsing_tab_observer_.reset(
       new safe_browsing::SafeBrowsingTabObserver(this));
     webnavigation_observer_.reset(
@@ skipping 65 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsObserver overrides
 
 void TabContents::WebContentsDestroyed(WebContents* tab) {
   // Destruction of the WebContents should only be done by us from our
   // destructor. Otherwise it's very likely we (or one of the helpers we own)
   // will attempt to access the WebContents and we'll crash.
   DCHECK(in_destructor_);
 }