media: Add out-of-line copy ctors for complex classes.

media/base/cdm_key_information.cc

 // Copyright 2015 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/stl_util.h"
 #include "media/base/cdm_key_information.h"
 
 namespace media {
 
 CdmKeyInformation::CdmKeyInformation()
@@ skipping 14 matching lines @@
                         system_code) {}
 
 CdmKeyInformation::CdmKeyInformation(const uint8_t* key_id_data,
                                      size_t key_id_length,
                                      KeyStatus status,
                                      uint32_t system_code)
     : key_id(key_id_data, key_id_data + key_id_length),
       status(status),
       system_code(system_code) {}
 
+CdmKeyInformation::CdmKeyInformation(const CdmKeyInformation& other) = default;
+
 CdmKeyInformation::~CdmKeyInformation() {
 }
 
 }  // namespace media