Switch CoreTabHelper to use WebContentsUserData.

chrome/browser/ui/tab_contents/tab_contents.h

Index: chrome/browser/ui/tab_contents/tab_contents.h
diff --git a/chrome/browser/ui/tab_contents/tab_contents.h b/chrome/browser/ui/tab_contents/tab_contents.h
index 4d5a8fdd6cd0a2585b952fb11a0f22989987038e..de3fad63e1c205c7171fae921c051c969029a85c 100644
--- a/chrome/browser/ui/tab_contents/tab_contents.h
+++ b/chrome/browser/ui/tab_contents/tab_contents.h
@@ -24,7 +24,6 @@ class BrowserTabstripTabContentsCreator;
 class ChromeWebContentsHandler;
 class ConstrainedWebDialogDelegateBase;
 class ConstrainedWindowTabHelper;
-class CoreTabHelper;
 class ExtensionTabUtil;
 class ExternalProtocolObserver;
 class ExternalTabContainerWin;
@@ -198,8 +197,6 @@ class TabContents : public content::WebContentsObserver {
     return constrained_window_tab_helper_.get();
   }
 
-  CoreTabHelper* core_tab_helper() { return core_tab_helper_.get(); }
-
   FaviconTabHelper* favicon_tab_helper() { return favicon_tab_helper_.get(); }
   FindTabHelper* find_tab_helper() { return find_tab_helper_.get(); }
   HistoryTabHelper* history_tab_helper() { return history_tab_helper_.get(); }
@@ -274,7 +271,6 @@ class TabContents : public content::WebContentsObserver {
   scoped_ptr<captive_portal::CaptivePortalTabHelper> captive_portal_tab_helper_;
 #endif
   scoped_ptr<ConstrainedWindowTabHelper> constrained_window_tab_helper_;
-  scoped_ptr<CoreTabHelper> core_tab_helper_;
   scoped_ptr<FaviconTabHelper> favicon_tab_helper_;
   scoped_ptr<FindTabHelper> find_tab_helper_;
   scoped_ptr<HistoryTabHelper> history_tab_helper_;