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

chrome/browser/printing/cloud_print/device_description.h

 // Copyright 2014 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 CHROME_BROWSER_PRINTING_CLOUD_PRINT_DEVICE_DESCRIPTION_H_
 #define CHROME_BROWSER_PRINTING_CLOUD_PRINT_DEVICE_DESCRIPTION_H_
 
 #include <string>
 
 #include "base/time/time.h"
 #include "net/base/host_port_pair.h"
 
 namespace local_discovery {
 struct ServiceDescription;
 }
 
 namespace cloud_print {
 
 struct DeviceDescription {
   DeviceDescription();
   explicit DeviceDescription(
       const local_discovery::ServiceDescription& service_description);
+  DeviceDescription(const DeviceDescription& other);
   ~DeviceDescription();
 
   bool IsValid() const;
 
   // Display attributes
   std::string name;
   std::string description;
 
   // Functional attributes
   std::string id;
   std::string type;
   int version;
 
   // Attributes related to local HTTP
   net::HostPortPair address;
 };
 
 }  // namespace cloud_print
 
 #endif  // CHROME_BROWSER_PRINTING_CLOUD_PRINT_DEVICE_DESCRIPTION_H_