Don't forget the ffmpeg input buffer padding when allocating a codec's
extradata buffer.

BUG=82438
Review URL: http://codereview.chromium.org/7137002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88354 0039d316-1c4b-4281-b951-d872f2087c98
FFmpegVideoDecodeEngine::~FFmpegVideoDecodeEngine() {
  if (codec_context_) {
    av_free(codec_context_->extradata);
    avcodec_close(codec_context_);
    av_free(codec_context_);
  }
}

FFmpegVideoDecodeEngine::~FFmpegVideoDecodeEngine() {
  if (codec_context_) {
    av_free(codec_context_->extradata);
    avcodec_close(codec_context_);
    av_free(codec_context_);
  }
}
