This CL removes all usages of our custom ostream << overloads.

This prepares us for removing them altogether.

Bug: webrtc:8982
Change-Id: I66002cc8d4bf0e07925766d568d2498422f0f38e
Reviewed-on: https://webrtc-review.googlesource.com/64142
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Reviewed-by: Henrik Grunell <henrikg@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22707}
diff --git a/rtc_base/socketaddress.cc b/rtc_base/socketaddress.cc
index 54a41d4..bddb7bc 100644
--- a/rtc_base/socketaddress.cc
+++ b/rtc_base/socketaddress.cc
@@ -26,12 +26,11 @@
 #include <unistd.h>
 #endif
 
-#include <sstream>
-
 #include "rtc_base/byteorder.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/nethelpers.h"
+#include "rtc_base/strings/string_builder.h"
 
 #if defined(WEBRTC_WIN)
 #include "rtc_base/win32.h"
@@ -161,21 +160,21 @@
 }
 
 std::string SocketAddress::PortAsString() const {
-  std::ostringstream ost;
-  ost << port_;
-  return ost.str();
+  return std::to_string(port_);
 }
 
 std::string SocketAddress::ToString() const {
-  std::ostringstream ost;
-  ost << *this;
-  return ost.str();
+  char buf[1024];
+  rtc::SimpleStringBuilder sb(buf);
+  sb << HostAsURIString() << ":" << port();
+  return sb.str();
 }
 
 std::string SocketAddress::ToSensitiveString() const {
-  std::ostringstream ost;
-  ost << HostAsSensitiveURIString() << ":" << port();
-  return ost.str();
+  char buf[1024];
+  rtc::SimpleStringBuilder sb(buf);
+  sb << HostAsSensitiveURIString() << ":" << port();
+  return sb.str();
 }
 
 bool SocketAddress::FromString(const std::string& str) {