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

chrome/browser/sync_file_system/drive_backend/sync_task_manager.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_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_MANAGER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 118 matching lines @@
   bool ShouldTrackTaskToken() const;
 
  private:
   struct PendingTask {
     base::Closure task;
     Priority priority;
     int64_t seq;
 
     PendingTask();
     PendingTask(const base::Closure& task, Priority pri, int seq);
+    PendingTask(const PendingTask& other);
     ~PendingTask();
   };
 
   struct PendingTaskComparator {
     bool operator()(const PendingTask& left,
                     const PendingTask& right) const;
   };
 
   // Non-static version of NotifyTaskDone.
   void NotifyTaskDoneBody(scoped_ptr<SyncTaskToken> token,
@@ skipping 59 matching lines @@
 
   base::WeakPtrFactory<SyncTaskManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncTaskManager);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_MANAGER_H_