Pass a WeakPtr of the decoder_ to prevent SEGFAULT.

content/common/gpu/media/video_decode_accelerator_unittest.cc

Index: content/common/gpu/media/video_decode_accelerator_unittest.cc
diff --git a/content/common/gpu/media/video_decode_accelerator_unittest.cc b/content/common/gpu/media/video_decode_accelerator_unittest.cc
index 439fb49453af4b6ecbdfce8138a76978159c08cf..ce5502e20a51c72746733ecbef47e7c00ddde099 100644
--- a/content/common/gpu/media/video_decode_accelerator_unittest.cc
+++ b/content/common/gpu/media/video_decode_accelerator_unittest.cc
@@ -485,7 +485,7 @@ void GLRenderingVDAClient::PictureReady(const media::Picture& picture) {
   if (num_decoded_frames_ > delay_reuse_after_frame_num_) {
     base::MessageLoop::current()->PostDelayedTask(FROM_HERE, base::Bind(
         &VideoDecodeAccelerator::ReusePictureBuffer,
-        base::Unretained(decoder_.get()), picture.picture_buffer_id()),
+        decoder_->AsWeakPtr(), picture.picture_buffer_id()),
         base::TimeDelta::FromMilliseconds(kReuseDelayMs));
   } else {
     decoder_->ReusePictureBuffer(picture.picture_buffer_id());