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

chrome/browser/sync_file_system/drive_backend/sync_task_manager.cc

 // 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.
 
 #include "chrome/browser/sync_file_system/drive_backend/sync_task_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 27 matching lines @@
 };
 
 }  // namespace
 
 SyncTaskManager::PendingTask::PendingTask() {}
 
 SyncTaskManager::PendingTask::PendingTask(
     const base::Closure& task, Priority pri, int seq)
     : task(task), priority(pri), seq(seq) {}
 
+SyncTaskManager::PendingTask::PendingTask(const PendingTask& other) = default;
+
 SyncTaskManager::PendingTask::~PendingTask() {}
 
 bool SyncTaskManager::PendingTaskComparator::operator()(
     const PendingTask& left,
     const PendingTask& right) const {
   if (left.priority != right.priority)
     return left.priority < right.priority;
   return left.seq > right.seq;
 }
 
@@ skipping 346 matching lines @@
     closure.Run();
     return;
   }
 
   if (client_)
     client_->MaybeScheduleNextTask();
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system