Remove per-tab preference machinery.

chrome/browser/ui/prefs/prefs_tab_helper.h

Index: chrome/browser/ui/prefs/prefs_tab_helper.h
diff --git a/chrome/browser/ui/prefs/prefs_tab_helper.h b/chrome/browser/ui/prefs/prefs_tab_helper.h
index 47c1f4b5ed9ce1230870f247dc7edee30f1d925c..281fee47dd2f410969f6d1c5715118e15f424d93 100644
--- a/chrome/browser/ui/prefs/prefs_tab_helper.h
+++ b/chrome/browser/ui/prefs/prefs_tab_helper.h
@@ -25,23 +25,13 @@ class PrefsTabHelper : public content::WebContentsObserver,
   virtual ~PrefsTabHelper();
 
   static void InitIncognitoUserPrefStore(OverlayUserPrefStore* pref_store);
-  static void InitPerTabUserPrefStore(OverlayUserPrefStore* pref_store);
   static void RegisterUserPrefs(PrefService* prefs);
 
-  PrefService* per_tab_prefs() { return per_tab_prefs_.get(); }
-
  protected:
   // Update the RenderView's WebPreferences. Exposed as protected for testing.
   virtual void UpdateWebPreferences();
 
-  // content::WebContentsObserver overrides, exposed as protected for testing.
-  virtual void RenderViewCreated(
-      content::RenderViewHost* render_view_host) OVERRIDE;
-
  private:
-  // content::WebContentsObserver overrides:
-  virtual void WebContentsDestroyed(content::WebContents* tab) OVERRIDE;
-
   // content::NotificationObserver overrides:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
@@ -54,9 +44,7 @@ class PrefsTabHelper : public content::WebContentsObserver,
 
   content::NotificationRegistrar registrar_;
 
-  scoped_ptr<PrefService> per_tab_prefs_;
   PrefChangeRegistrar pref_change_registrar_;
-  PrefChangeRegistrar per_tab_pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefsTabHelper);
 };