Bug 1859786 - Fix clang-tidy warning in video_capture_impl.cc. r=webr…

…tc-reviewers,mjf

clang-tidy says:
  'auto dataCallBack' can be declared as 'auto *dataCallBack'

Differential Revision: https://phabricator.services.mozilla.com/D191302

third_party/libwebrtc/modules/video_capture/video_capture_impl.cc

@@ -134,7 +134,7 @@ int32_t VideoCaptureImpl::DeliverCapturedFrame(VideoFrame& captureFrame) {
 
   UpdateFrameCount();  // frame count used for local frame rate callback.
 
-  for (auto dataCallBack : _dataCallBacks) {
+  for (auto* dataCallBack : _dataCallBacks) {
     dataCallBack->OnFrame(captureFrame);
   }