Clean up TCW, make it solely a hub for 1:1 observer/helper objects.

chrome/browser/ui/alternate_error_tab_observer.cc

 // Copyright (c) 2011 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/alternate_error_tab_observer.h"
 
 #include "chrome/browser/google/google_util.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "content/browser/renderer_host/render_view_host.h"
+#include "content/browser/tab_contents/tab_contents.h"
 #include "content/public/browser/notification_service.h"
 
 AlternateErrorPageTabObserver::AlternateErrorPageTabObserver(
     TabContentsWrapper* wrapper)
         : TabContentsObserver(wrapper->tab_contents()),
           wrapper_(wrapper) {
   PrefService* prefs = wrapper_->profile()->GetPrefs();
   if (prefs) {
     pref_change_registrar_.Init(prefs);
     pref_change_registrar_.Add(prefs::kAlternateErrorPagesEnabled, this);
@@ skipping 62 matching lines @@
         GURL(google_util::kLinkDoctorBaseURL));
     url = google_util::AppendGoogleTLDParam(url);
   }
   return url;
 }
 
 void AlternateErrorPageTabObserver::UpdateAlternateErrorPageURL(
     RenderViewHost* rvh) {
   rvh->SetAltErrorPageURL(GetAlternateErrorPageURL());
 }