Add the "virtual" keyword on method overrides that are missing it.

webkit/glue/plugins/pepper_video_decoder.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 WEBKIT_GLUE_PLUGINS_PEPPER_VIDEO_DECODER_H_
 #define WEBKIT_GLUE_PLUGINS_PEPPER_VIDEO_DECODER_H_
 
 #include "base/scoped_ptr.h"
 #include "webkit/glue/plugins/pepper_plugin_delegate.h"
 #include "webkit/glue/plugins/pepper_resource.h"
@@ skipping 10 matching lines @@
 class VideoDecoder : public Resource {
  public:
   VideoDecoder(PluginInstance* instance);
   virtual ~VideoDecoder();
 
   // Returns a pointer to the interface implementing PPB_VideoDecoder that is
   // exposed to the plugin.
   static const PPB_VideoDecoder_Dev* GetInterface();
 
   // Resource overrides.
-  VideoDecoder* AsVideoDecoder() { return this; }
+  virtual VideoDecoder* AsVideoDecoder();
 
   PluginInstance* instance() { return instance_.get(); }
 
   // PPB_VideoDecoder implementation.
   bool Init(const PP_VideoDecoderConfig_Dev& decoder_config);
   bool Decode(PP_VideoCompressedDataBuffer_Dev& input_buffer);
   int32_t Flush(PP_CompletionCallback& callback);
   bool ReturnUncompressedDataBuffer(PP_VideoUncompressedDataBuffer_Dev& buffer);
 
  private:
   // This is NULL before initialization, and if this VideoDecoder is
   // swapped with another.
   scoped_ptr<PluginDelegate::PlatformVideoDecoder> platform_video_decoder_;
   scoped_refptr<PluginInstance> instance_;
 };
 
 }  // namespace pepper
 
 #endif  // WEBKIT_GLUE_PLUGINS_PEPPER_VIDEO_DECODER_H_