Merge "Remove one log message from the VPXDecoder"

    vpx_image_t *img = vpx_codec_get_frame((vpx_codec_ctx_t *)mCtx, &iter);

    if (img == NULL) {

        LOGI("on2 decoder did not return a frame.");

        // The VPX format supports "internal-only" frames that are

        // referenced by future content but never actually displayed, so

        // this is a perfectly valid scenario.

        *out = new MediaBuffer(0);

        return OK;