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

components/sync_driver/glue/sync_backend_host_core.cc

 // 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.
 
 #include "components/sync_driver/glue/sync_backend_host_core.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 98 matching lines @@
       unrecoverable_error_handler(unrecoverable_error_handler),
       report_unrecoverable_error_function(report_unrecoverable_error_function),
       saved_nigori_state(std::move(saved_nigori_state)),
       clear_data_option(clear_data_option),
       invalidation_versions(invalidation_versions) {}
 
 DoInitializeOptions::~DoInitializeOptions() {}
 
 DoConfigureSyncerTypes::DoConfigureSyncerTypes() {}
 
+DoConfigureSyncerTypes::DoConfigureSyncerTypes(
+    const DoConfigureSyncerTypes& other) = default;
+
 DoConfigureSyncerTypes::~DoConfigureSyncerTypes() {}
 
 SyncBackendHostCore::SyncBackendHostCore(
     const std::string& name,
     const base::FilePath& sync_data_folder_path,
     bool has_sync_setup_completed,
     const base::WeakPtr<SyncBackendHostImpl>& backend)
     : name_(name),
       sync_data_folder_path_(sync_data_folder_path),
       host_(backend),
@@ skipping 655 matching lines @@
 
 void SyncBackendHostCore::ClearServerDataDone(
     const base::Closure& frontend_callback) {
   DCHECK_EQ(base::MessageLoop::current(), sync_loop_);
   host_.Call(FROM_HERE, &SyncBackendHostImpl::ClearServerDataDoneOnFrontendLoop,
              frontend_callback);
 }
 
 
 }  // namespace browser_sync