message: Fix usage of absl::c_accumulate.
  Cr-Commit-Position: refs/heads/main@{#39026}
diff: @@ -68,7 +68,7 @@ rtc::Buffer GenerateNalUnit(size_t size) {
  // Create frame consisting of nalus of given size.
  rtc::Buffer CreateFrame(std::initializer_list<size_t> nalu_sizes) {
  static constexpr int kStartCodeSize = 3;
  - rtc::Buffer frame(absl::c_accumulate(nalu_sizes, 0) +
  + rtc::Buffer frame(absl::c_accumulate(nalu_sizes, size_t{0}) +
  kStartCodeSize * nalu_sizes.size());
  size_t offset = 0;
  for (size_t nalu_size : nalu_sizes) {
  