Remove some streams from rtc_base/

Bug: webrtc:8982
Change-Id: Id372dde980fae493debf20873b6aeee8a7f1b045
Reviewed-on: https://webrtc-review.googlesource.com/78781
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23396}

rtc_base/BUILD.gn

@@ -654,6 +654,7 @@ rtc_static_library("rtc_numerics") {
 }
 
 rtc_source_set("rtc_json") {
+  testonly = true
   defines = []
   sources = [
     "json.cc",

rtc_base/filerotatingstream.cc

@@ -11,14 +11,15 @@
 #include "rtc_base/filerotatingstream.h"
 
 #include <algorithm>
-#include <iostream>
+#include <cstdio>
 #include <string>
 
 #include "rtc_base/checks.h"
 #include "rtc_base/fileutils.h"
 #include "rtc_base/pathutils.h"
+#include "rtc_base/strings/string_builder.h"
 
-// Note: We use std::cerr for logging in the write paths of this stream to avoid
+// Note: We use fprintf for logging in the write paths of this stream to avoid
 // infinite loops when logging.
 
 namespace rtc {
@@ -149,7 +150,7 @@ StreamResult FileRotatingStream::Write(const void* data,
     return SR_EOS;
   }
   if (!file_stream_) {
-    std::cerr << "Open() must be called before Write." << std::endl;
+    std::fprintf(stderr, "Open() must be called before Write.\n");
     return SR_ERROR;
   }
   // Write as much as will fit in to the current file.
@@ -213,7 +214,7 @@ bool FileRotatingStream::Open() {
       std::vector<std::string> matching_files = GetFilesWithPrefix();
       for (auto matching_file : matching_files) {
         if (!Filesystem::DeleteFile(matching_file)) {
-          std::cerr << "Failed to delete: " << matching_file << std::endl;
+          std::fprintf(stderr, "Failed to delete: %s\n", matching_file.c_str());
         }
       }
       return OpenCurrentFile();
@@ -225,8 +226,7 @@ bool FileRotatingStream::Open() {
 bool FileRotatingStream::DisableBuffering() {
   disable_buffering_ = true;
   if (!file_stream_) {
-    std::cerr << "Open() must be called before DisableBuffering()."
-              << std::endl;
+    std::fprintf(stderr, "Open() must be called before DisableBuffering().\n");
     return false;
   }
   return file_stream_->DisableBuffering();
@@ -257,8 +257,8 @@ bool FileRotatingStream::OpenCurrentFile() {
   }
   int error = 0;
   if (!file_stream_->Open(file_path, mode, &error)) {
-    std::cerr << "Failed to open: " << file_path << "Error: " << error
-              << std::endl;
+    std::fprintf(stderr, "Failed to open: %s Error: %i\n", file_path.c_str(),
+                 error);
     file_stream_.reset();
     return false;
   }
@@ -286,7 +286,7 @@ void FileRotatingStream::RotateFiles() {
   std::string file_to_delete = file_names_[rotation_index_];
   if (Filesystem::IsFile(file_to_delete)) {
     if (!Filesystem::DeleteFile(file_to_delete)) {
-      std::cerr << "Failed to delete: " << file_to_delete << std::endl;
+      std::fprintf(stderr, "Failed to delete: %s\n", file_to_delete.c_str());
     }
   }
   for (auto i = rotation_index_; i > 0; --i) {
@@ -294,8 +294,8 @@ void FileRotatingStream::RotateFiles() {
     std::string unrotated_name = file_names_[i - 1];
     if (Filesystem::IsFile(unrotated_name)) {
       if (!Filesystem::MoveFile(unrotated_name, rotated_name)) {
-        std::cerr << "Failed to move: " << unrotated_name << " to "
-                  << rotated_name << std::endl;
+        std::fprintf(stderr, "Failed to move: %s to %s\n",
+                     unrotated_name.c_str(), rotated_name.c_str());
       }
     }
   }
@@ -327,7 +327,8 @@ std::vector<std::string> FileRotatingStream::GetFilesWithPrefix() const {
 std::string FileRotatingStream::GetFilePath(size_t index,
                                             size_t num_files) const {
   RTC_DCHECK_LT(index, num_files);
-  std::ostringstream file_name;
+  char buf[1024];
+  rtc::SimpleStringBuilder file_name(buf);
   // The format will be "_%<num_digits>zu". We want to zero pad the index so
   // that it will sort nicely.
   size_t max_digits = ((num_files - 1) / 10) + 1;

rtc_base/logsinks.cc

@@ -10,7 +10,7 @@
 
 #include "rtc_base/logsinks.h"
 
-#include <iostream>
+#include <cstdio>
 #include <string>
 
 #include "rtc_base/checks.h"
@@ -37,7 +37,7 @@ FileRotatingLogSink::~FileRotatingLogSink() {
 
 void FileRotatingLogSink::OnLogMessage(const std::string& message) {
   if (stream_->GetState() != SS_OPEN) {
-    std::cerr << "Init() must be called before adding this sink." << std::endl;
+    std::fprintf(stderr, "Init() must be called before adding this sink.\n");
     return;
   }
   stream_->WriteAll(message.c_str(), message.size(), nullptr, nullptr);

rtc_base/macutils.cc

@@ -10,7 +10,6 @@
 
 #include <cstring>
 #include <memory>
-#include <sstream>
 
 #include <sys/utsname.h>