Virtual destructors should have virtual keyword.

content/renderer/renderer_webidbobjectstore_impl.h

 // Copyright (c) 2010 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_RENDERER_RENDERER_WEBIDBOBJECTSTORE_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_WEBIDBOBJECTSTORE_IMPL_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBCallbacks.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebIDBObjectStore.h"
 
 namespace WebKit {
 class WebFrame;
 class WebIDBCallbacks;
 class WebIDBIndex;
 class WebIDBKey;
 class WebIDBKeyRange;
 class WebString;
 }
 
 class RendererWebIDBObjectStoreImpl : public WebKit::WebIDBObjectStore {
  public:
   explicit RendererWebIDBObjectStoreImpl(int32 idb_object_store_id);
-  ~RendererWebIDBObjectStoreImpl();
+  virtual ~RendererWebIDBObjectStoreImpl();
 
   // WebKit::WebIDBObjectStore
   virtual WebKit::WebString name() const;
   virtual WebKit::WebString keyPath() const;
   virtual WebKit::WebDOMStringList indexNames() const;
 
   virtual void get(const WebKit::WebIDBKey& key,
                    WebKit::WebIDBCallbacks* callbacks,
                    const WebKit::WebIDBTransaction& transaction,
                    WebKit::WebExceptionCode& ec);
@@ skipping 27 matching lines @@
   virtual void openCursor(const WebKit::WebIDBKeyRange& idb_key_range,
                   unsigned short direction,
                   WebKit::WebIDBCallbacks* callbacks,
                   const WebKit::WebIDBTransaction& transaction,
                   WebKit::WebExceptionCode& ec);
  private:
   int32 idb_object_store_id_;
 };
 
 #endif  // CONTENT_RENDERER_RENDERER_WEBIDBOBJECTSTORE_IMPL_H_