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

chrome/browser/media_galleries/linux/snapshot_file_details.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERIES_LINUX_SNAPSHOT_FILE_DETAILS_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_SNAPSHOT_FILE_DETAILS_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "chrome/browser/media_galleries/fileapi/mtp_device_async_delegate.h"
 
 // Used to represent snapshot file request params.
 struct SnapshotRequestInfo {
   SnapshotRequestInfo(
       uint32_t file_id,
       const base::FilePath& snapshot_file_path,
       const MTPDeviceAsyncDelegate::CreateSnapshotFileSuccessCallback&
           success_callback,
       const MTPDeviceAsyncDelegate::ErrorCallback& error_callback);
+  SnapshotRequestInfo(const SnapshotRequestInfo& other);
   ~SnapshotRequestInfo();
 
   // MTP device file id.
   const uint32_t file_id;
 
   // Local platform path of the snapshot file.
   const base::FilePath snapshot_file_path;
 
   // A callback to be called when CreateSnapshotFile() succeeds.
   const MTPDeviceAsyncDelegate::CreateSnapshotFileSuccessCallback
@@ skipping 65 matching lines @@
   // Number of bytes written into the snapshot file.
   uint32_t bytes_written_;
 
   // Whether an error occurred during file transfer.
   bool error_occurred_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotFileDetails);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_SNAPSHOT_FILE_DETAILS_H_