Refcount the host content settings map from the content exceptions table model.

chrome/browser/content_exceptions_table_model.h

Index: chrome/browser/content_exceptions_table_model.h
diff --git a/chrome/browser/content_exceptions_table_model.h b/chrome/browser/content_exceptions_table_model.h
index f30633fc7606c33d3f396bd27a0e0e195c428e1d..8e29591e8af88cd617af48665be5166929d02507 100644
--- a/chrome/browser/content_exceptions_table_model.h
+++ b/chrome/browser/content_exceptions_table_model.h
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "app/table_model.h"
+#include "base/ref_counted.h"
 #include "chrome/common/content_settings.h"
 #include "chrome/common/content_settings_types.h"
 #include "chrome/browser/host_content_settings_map.h"
@@ -63,8 +64,8 @@ class ContentExceptionsTableModel : public TableModel {
     return is_off_the_record ? off_the_record_entries_ : entries_;
   }
 
-  HostContentSettingsMap* map_;
-  HostContentSettingsMap* off_the_record_map_;
+  scoped_refptr<HostContentSettingsMap> map_;
+  scoped_refptr<HostContentSettingsMap> off_the_record_map_;
   ContentSettingsType content_type_;
   HostContentSettingsMap::SettingsForOneType entries_;
   HostContentSettingsMap::SettingsForOneType off_the_record_entries_;