Use accumulate to calculate recv_delta_size

It's a modern way to sum element of an a array.

Bug: None
Change-Id: Idb09442b4647b4be9771f64a7a561b305bd9aa6b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/233942
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35139}
diff --git a/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.cc b/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.cc
index 4b1ab9e..16f88a0 100644
--- a/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.cc
+++ b/modules/rtp_rtcp/source/rtcp_packet/transport_feedback.cc
@@ -12,8 +12,10 @@
 
 #include <algorithm>
 #include <cstdint>
+#include <numeric>
 #include <utility>
 
+#include "absl/algorithm/container.h"
 #include "modules/include/module_common_types_public.h"
 #include "modules/rtp_rtcp/source/byte_io.h"
 #include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
@@ -447,10 +449,7 @@
   num_seq_no_ = status_count;
 
   uint16_t seq_no = base_seq_no_;
-  size_t recv_delta_size = 0;
-  for (size_t delta_size : delta_sizes) {
-    recv_delta_size += delta_size;
-  }
+  size_t recv_delta_size = absl::c_accumulate(delta_sizes, 0);
 
   // Determine if timestamps, that is, recv_delta are included in the packet.
   if (end_index >= index + recv_delta_size) {