In video replace non-owning pointer to rtc::TaskQueue with non-owning pointer to TaskQueueBase

rtc::TaskQueue is a simple wrapper over TaskQueueBase and adds no
extra features when task queue is used without passing ownership.

Reducing usage of the internal rtc::TaskQueue wrapper gives users more flexibility how TaskQueueBase* is stored.

Bug: webrtc:14169
Change-Id: If5c8827544c843502c7dfcef775ac558de79ec3a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/268189
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37549}

video/video_stream_decoder_impl.cc

@@ -141,7 +141,7 @@ void VideoStreamDecoderImpl::StartNextDecode() {
   int64_t max_wait_time = keyframe_required_ ? 200 : 3000;
 
   frame_buffer_.NextFrame(max_wait_time, keyframe_required_,
-                          &bookkeeping_queue_,
+                          bookkeeping_queue_.Get(),
                           [this](std::unique_ptr<EncodedFrame> frame) {
                             RTC_DCHECK_RUN_ON(&bookkeeping_queue_);
                             OnNextFrameCallback(std::move(frame));