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

chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.cc

 // 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.
 
 #include "chrome/browser/media_galleries/linux/mtp_device_delegate_impl_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 
@@ skipping 349 matching lines @@
     const base::FilePath& path,
     content::BrowserThread::ID thread_id,
     const tracked_objects::Location& location,
     const base::Closure& task)
     : path(path),
       thread_id(thread_id),
       location(location),
       task(task) {
 }
 
+MTPDeviceDelegateImplLinux::PendingTaskInfo::PendingTaskInfo(
+    const PendingTaskInfo& other) = default;
+
 MTPDeviceDelegateImplLinux::PendingTaskInfo::~PendingTaskInfo() {
 }
 
 // Represents a file on the MTP device.
 // Lives on the IO thread.
 class MTPDeviceDelegateImplLinux::MTPFileNode {
  public:
   MTPFileNode(uint32_t file_id,
               const std::string& file_name,
               MTPFileNode* parent,
@@ skipping 1515 matching lines @@
   }
 }
 
 void CreateMTPDeviceAsyncDelegate(
     const std::string& device_location,
     const bool read_only,
     const CreateMTPDeviceAsyncDelegateCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   callback.Run(new MTPDeviceDelegateImplLinux(device_location, read_only));
 }