Remove use of <iostream> where unnecessary.

base/debug/debugger_posix.cc

 // Copyright (c) 2011 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.
 
 #include "base/debug/debugger.h"
 #include "build/build_config.h"
 
 #include <errno.h>
 #include <execinfo.h>
 #include <fcntl.h>
@@ skipping 12 matching lines @@
 #endif
 
 #if defined(OS_MACOSX)
 #include <AvailabilityMacros.h>
 #endif
 
 #if defined(OS_MACOSX) || defined(OS_OPENBSD) || defined(OS_FREEBSD)
 #include <sys/sysctl.h>
 #endif
 
-#include <iostream>
+#include <ostream>
 
 #include "base/basictypes.h"
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/safe_strerror_posix.h"
 #include "base/string_piece.h"
 #include "base/stringprintf.h"
 
 #if defined(USE_SYMBOLIZE)
@@ skipping 151 matching lines @@
 
 void BreakDebugger() {
   DEBUG_BREAK();
 #if defined(NDEBUG)
   _exit(1);
 #endif
 }
 
 }  // namespace debug
 }  // namespace base