Remove <iostream> where possible.

sandbox/linux/seccomp/library.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define XOPEN_SOURCE 500
 #include <algorithm>
 #include <elf.h>
 #include <errno.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <iostream>
 #include <linux/unistd.h>
 #include <set>
 #include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/ptrace.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ skipping 1178 matching lines @@
   }
   iter = symbols_.find("__kernel_rt_sigreturn");
   if (iter != symbols_.end() && iter->second.st_value) {
     __kernel_rt_sigreturn = asr_offset_ + iter->second.st_value;
   }
 
   return true;
 }
 
 } // namespace