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

components/sync_driver/glue/sync_backend_host_core.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 COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_CORE_H_
 #define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_CORE_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 62 matching lines @@
   base::Closure report_unrecoverable_error_function;
   scoped_ptr<syncer::SyncEncryptionHandler::NigoriState> saved_nigori_state;
   const syncer::PassphraseTransitionClearDataOption clear_data_option;
   const std::map<syncer::ModelType, int64_t> invalidation_versions;
 };
 
 // Helper struct to handle currying params to
 // SyncBackendHost::Core::DoConfigureSyncer.
 struct DoConfigureSyncerTypes {
   DoConfigureSyncerTypes();
+  DoConfigureSyncerTypes(const DoConfigureSyncerTypes& other);
   ~DoConfigureSyncerTypes();
   syncer::ModelTypeSet to_download;
   syncer::ModelTypeSet to_purge;
   syncer::ModelTypeSet to_journal;
   syncer::ModelTypeSet to_unapply;
 };
 
 class SyncBackendHostCore
     : public base::RefCountedThreadSafe<SyncBackendHostCore>,
       public syncer::SyncEncryptionHandler::Observer,
@@ skipping 232 matching lines @@
   std::map<syncer::ModelType, int64_t> last_invalidation_versions_;
 
   base::WeakPtrFactory<SyncBackendHostCore> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostCore);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_CORE_H_