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

chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h

 // Copyright (c) 2012 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_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 33 matching lines @@
     PENDING_INIT,
     INITIALIZED
   };
 
   // Used to represent pending task details.
   struct PendingTaskInfo {
     PendingTaskInfo(const base::FilePath& path,
                     content::BrowserThread::ID thread_id,
                     const tracked_objects::Location& location,
                     const base::Closure& task);
+    PendingTaskInfo(const PendingTaskInfo& other);
     ~PendingTaskInfo();
 
     base::FilePath path;
     base::FilePath cached_path;
     const content::BrowserThread::ID thread_id;
     const tracked_objects::Location location;
     const base::Closure task;
   };
 
   class MTPFileNode;
@@ skipping 457 matching lines @@
   // the ReadDirectory operation.
   FileInfoCache file_info_cache_;
 
   // For callbacks that may run after destruction.
   base::WeakPtrFactory<MTPDeviceDelegateImplLinux> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MTPDeviceDelegateImplLinux);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_DELEGATE_IMPL_LINUX_H_