Create CoreTabHelper, move remaining core TCW functionality into it.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index ed999095955e4e378d22d036847fcc8b667e8242..169f6bedd6c2b7f34fd492b524bb7a685b34653f 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -50,10 +50,10 @@
 #include "chrome/browser/tabs/pinned_tab_codec.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/browser/translate/translate_prefs.h"
+#include "chrome/browser/ui/alternate_error_tab_observer.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/prefs/prefs_tab_helper.h"
 #include "chrome/browser/ui/search_engines/keyword_editor_controller.h"
-#include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/webui/flags_ui.h"
 #include "chrome/browser/ui/webui/ntp/new_tab_page_handler.h"
 #include "chrome/browser/ui/webui/ntp/new_tab_ui.h"
@@ -155,7 +155,7 @@ void RegisterUserPrefs(PrefService* user_prefs) {
   chrome_browser_net::Predictor::RegisterUserPrefs(user_prefs);
   DownloadPrefs::RegisterUserPrefs(user_prefs);
   bookmark_utils::RegisterUserPrefs(user_prefs);
-  TabContentsWrapper::RegisterUserPrefs(user_prefs);
+  AlternateErrorPageTabObserver::RegisterUserPrefs(user_prefs);
   PrefsTabHelper::RegisterUserPrefs(user_prefs);
   TemplateURLPrepopulateData::RegisterUserPrefs(user_prefs);
   ExtensionWebUI::RegisterUserPrefs(user_prefs);