Virtual destructors should have virtual keyword.

content/browser/renderer_host/sync_resource_handler.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_SYNC_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_SYNC_RESOURCE_HANDLER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 29 matching lines @@
                           int min_size);
   virtual bool OnReadCompleted(int request_id, int* bytes_read);
   virtual bool OnResponseCompleted(int request_id,
                                    const net::URLRequestStatus& status,
                                    const std::string& security_info);
   virtual void OnRequestClosed();
 
  private:
   enum { kReadBufSize = 3840 };
 
-  ~SyncResourceHandler();
+  virtual ~SyncResourceHandler();
 
   scoped_refptr<net::IOBuffer> read_buffer_;
 
   SyncLoadResult result_;
   ResourceMessageFilter* filter_;
   IPC::Message* result_message_;
   ResourceDispatcherHost* rdh_;
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_SYNC_RESOURCE_HANDLER_H_