Fix a leak that only happens in layout test mode.

webkit/glue/webclipboard_impl.h

 // Copyright (c) 2009 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 WEBCLIPBOARD_IMPL_H_
 #define WEBCLIPBOARD_IMPL_H_
 
 #include "webkit/api/public/WebClipboard.h"
 
 #include <string>
 
 namespace webkit_glue {
 
 class WebClipboardImpl : public WebKit::WebClipboard {
  public:
   static std::string URLToMarkup(const WebKit::WebURL& url,
       const WebKit::WebString& title);
   static std::string URLToImageMarkup(const WebKit::WebURL& url,
       const WebKit::WebString& title);
 
+  virtual ~WebClipboardImpl() {}
+
   // WebClipboard methods:
   virtual bool isFormatAvailable(WebKit::WebClipboard::Format);
   virtual WebKit::WebString readPlainText();
   virtual WebKit::WebString readHTML(WebKit::WebURL* source_url);
   virtual void writeHTML(
       const WebKit::WebString& html_text,
       const WebKit::WebURL& source_url,
       const WebKit::WebString& plain_text,
       bool write_smart_paste);
   virtual void writeURL(
       const WebKit::WebURL&,
       const WebKit::WebString& title);
   virtual void writeImage(
       const WebKit::WebImage&,
       const WebKit::WebURL& source_url,
       const WebKit::WebString& title);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBCLIPBOARD_IMPL_H_