RefCounted types should not have public destructors, content/browser part 2

content/common/db_message_filter.h

Index: content/common/db_message_filter.h
diff --git a/content/common/db_message_filter.h b/content/common/db_message_filter.h
index 29d45d0c85b759319d2ce96937df5b3adfd74253..c77ee222e14e565f38a15ccd2515ee8ff0cd2ec6 100644
--- a/content/common/db_message_filter.h
+++ b/content/common/db_message_filter.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -14,9 +14,13 @@ class DBMessageFilter : public IPC::ChannelProxy::MessageFilter {
  public:
   DBMessageFilter();
 
- private:
+  // IPC::ChannelProxy::MessageFilter
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
+ protected:
+  virtual ~DBMessageFilter() {}
+
+ private:
   void OnDatabaseUpdateSize(const string16& origin_identifier,
                             const string16& database_name,
                             int64 database_size);