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

chrome/browser/browsing_data/browsing_data_file_system_helper.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_BROWSING_DATA_BROWSING_DATA_FILE_SYSTEM_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_FILE_SYSTEM_HELPER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 26 matching lines @@
 // data) by calling DeleteFileSystemOrigin() on the UI thread. Calling
 // DeleteFileSystemOrigin() for an origin that doesn't have any is safe; it's
 // just an expensive NOOP.
 class BrowsingDataFileSystemHelper
     : public base::RefCountedThreadSafe<BrowsingDataFileSystemHelper> {
  public:
   // Detailed information about a file system, including it's origin GURL,
   // the amount of data (in bytes) for each sandboxed filesystem type.
   struct FileSystemInfo {
     explicit FileSystemInfo(const GURL& origin);
+    FileSystemInfo(const FileSystemInfo& other);
     ~FileSystemInfo();
 
     // The origin for which the information is relevant.
     GURL origin;
     // FileSystemType to usage (in bytes) map.
     std::map<storage::FileSystemType, int64_t> usage_map;
   };
 
   using FetchCallback = base::Callback<void(const std::list<FileSystemInfo>&)>;
 
@@ skipping 72 matching lines @@
  private:
   ~CannedBrowsingDataFileSystemHelper() override;
 
   // Holds the current list of filesystems returned to the client.
   std::list<FileSystemInfo> file_system_info_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataFileSystemHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_FILE_SYSTEM_HELPER_H_