Remove <iostream> where possible.

net/base/x509_cert_types.h

 // Copyright (c) 2007-2010 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.
 
 #ifndef NET_BASE_X509_CERT_TYPES_H_
 #define NET_BASE_X509_CERT_TYPES_H_
 
 #include <string.h>
 
 #include <functional>
-#include <iostream>
+#include <iosfwd>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/ref_counted.h"
 #include "base/singleton.h"
 #include "base/time.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 
@@ skipping 106 matching lines @@
 // Compares two OIDs by value.
 inline bool CSSMOIDEqual(const CSSM_OID* oid1, const CSSM_OID* oid2) {
   return oid1->Length == oid2->Length &&
   (memcmp(oid1->Data, oid2->Data, oid1->Length) == 0);
 }
 #endif
 
 }  // namespace net
 
 #endif  // NET_BASE_X509_CERT_TYPES_H_