Replace libchrome NumberToString with std::format

Replaces NumberToString in <base/string/string_number_conversions.h>
with std::format().
This change is very mechanical, no change in program behavior.

Test: build
Bug: 360917504
Change-Id: Iad92c9d4f4426790d8c38943147dede6eb873cb1
diff --git a/common/cpu_limiter.cc b/common/cpu_limiter.cc
index 5f1ae6f..3226390 100644
--- a/common/cpu_limiter.cc
+++ b/common/cpu_limiter.cc
@@ -20,7 +20,6 @@
 
 #include <base/bind.h>
 #include <base/logging.h>
-#include <base/strings/string_number_conversions.h>
 #include <base/time/time.h>
 
 #include "update_engine/common/utils.h"
@@ -67,7 +66,7 @@
   if (shares_ == shares)
     return true;
 
-  std::string string_shares = base::NumberToString(static_cast<int>(shares));
+  std::string string_shares = std::format("{}", static_cast<int>(shares));
   LOG(INFO) << "Setting cgroup cpu shares to  " << string_shares;
   if (!utils::WriteFile(
           kCGroupSharesPath, string_shares.c_str(), string_shares.size())) {