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

webkit/glue/plugins/pepper_video_decoder.cc

 // 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.
 
 #include "webkit/glue/plugins/pepper_video_decoder.h"
 
 #include "base/logging.h"
 #include "ppapi/c/dev/pp_video_dev.h"
 #include "ppapi/c/dev/ppb_video_decoder_dev.h"
 #include "ppapi/c/pp_completion_callback.h"
@@ skipping 88 matching lines @@
 }
 
 VideoDecoder::~VideoDecoder() {
 }
 
 // static
 const PPB_VideoDecoder_Dev* VideoDecoder::GetInterface() {
   return &ppb_videodecoder;
 }
 
+VideoDecoder* VideoDecoder::AsVideoDecoder() {
+  return this;
+}
+
 bool VideoDecoder::Init(const PP_VideoDecoderConfig_Dev& decoder_config) {
   if (!instance())
     return false;
 
   platform_video_decoder_.reset(
       instance()->delegate()->CreateVideoDecoder(decoder_config));
 
   return platform_video_decoder_.get()? true : false;
 }
 
@@ skipping 13 matching lines @@
 
 bool VideoDecoder::ReturnUncompressedDataBuffer(
     PP_VideoUncompressedDataBuffer_Dev& buffer) {
   if (!platform_video_decoder_.get())
     return false;
 
   return platform_video_decoder_->ReturnUncompressedDataBuffer(buffer);
 }
 
 }  // namespace pepper