Fix content settings bubble crash.

chrome/browser/content_settings/tab_specific_content_settings.h

Index: chrome/browser/content_settings/tab_specific_content_settings.h
diff --git a/chrome/browser/content_settings/tab_specific_content_settings.h b/chrome/browser/content_settings/tab_specific_content_settings.h
index ba0281142fe22e2281435480a6f257cf9151f09e..7536b4d0094763c48f8f9f21cdf436becef773ea 100644
--- a/chrome/browser/content_settings/tab_specific_content_settings.h
+++ b/chrome/browser/content_settings/tab_specific_content_settings.h
@@ -288,8 +288,8 @@ class TabSpecificContentSettings : public content::WebContentsObserver,
   // Notifies all registered |SiteDataObserver|s.
   void NotifySiteDataObservers();
 
-  // All currently registered |SiteDataObserver|.
-  ObserverList<SiteDataObserver, true> observer_list_;
+  // All currently registered |SiteDataObserver|s.
+  ObserverList<SiteDataObserver> observer_list_;
 
   // Stores which content setting types actually have blocked content.
   bool content_blocked_[CONTENT_SETTINGS_NUM_TYPES];