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

chrome/browser/extensions/api/mdns/dns_sd_delegate.h

 // Copyright 2013 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_EXTENSIONS_API_MDNS_DNS_SD_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
 namespace extensions {
 
 struct DnsSdService {
   std::string service_name;
   std::string service_host_port;
   std::string ip_address;
   std::vector<std::string> service_data;
 
   DnsSdService();
+  DnsSdService(const DnsSdService& other);
   virtual ~DnsSdService();
 
   bool operator==(const DnsSdService& other) const {
     return service_name == other.service_name &&
            service_host_port == other.service_host_port &&
            ip_address == other.ip_address &&
            service_data == other.service_data;
   }
 
   bool operator!=(const DnsSdService& other) const {
     return !(*this == other);
   }
 };
 
 // Delegate that is notified when a watched service is added, updated or
 // removed.
 class DnsSdDelegate {
  public:
   virtual void ServiceChanged(const std::string& service_type,
                               bool added,
                               const DnsSdService& service) = 0;
   virtual void ServiceRemoved(const std::string& service_type,
                               const std::string& service_name) = 0;
   virtual void ServicesFlushed(const std::string& service_type) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_DELEGATE_H_