The FieldTrialList<T> class hold values internally in a std::vector<T>.
One call site assumes a const T& can be retrieved from the vector, but
it turns out that std::vector<bool> has a bit-packed specialization
which means a normal reference can't be generated.
To work around this, change the code to instead use
typename std::vector<T>::const_reference.
Bug: webrtc:13655
Change-Id: I2a515b7064c8760e1a59d1910d59b1bd2c7a6622
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/250543
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Auto-Submit: Erik Språng <sprang@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35902}
da897930c3