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

chrome/browser/browsing_data/browsing_data_database_helper.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/browsing_data/browsing_data_database_helper.h"
 
 #include <tuple>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 19 matching lines @@
     const std::string& database_name,
     const std::string& description,
     int64_t size,
     base::Time last_modified)
     : identifier(identifier),
       database_name(database_name),
       description(description),
       size(size),
       last_modified(last_modified) {}
 
+BrowsingDataDatabaseHelper::DatabaseInfo::DatabaseInfo(
+    const DatabaseInfo& other) = default;
+
 BrowsingDataDatabaseHelper::DatabaseInfo::~DatabaseInfo() {}
 
 BrowsingDataDatabaseHelper::BrowsingDataDatabaseHelper(Profile* profile)
     : tracker_(BrowserContext::GetDefaultStoragePartition(profile)
                    ->GetDatabaseTracker()) {}
 
 BrowsingDataDatabaseHelper::~BrowsingDataDatabaseHelper() {
 }
 
 void BrowsingDataDatabaseHelper::StartFetching(const FetchCallback& callback) {
@@ skipping 138 matching lines @@
        ++it) {
     if (it->origin == origin && it->name == name) {
       pending_database_info_.erase(it);
       break;
     }
   }
   BrowsingDataDatabaseHelper::DeleteDatabase(origin_identifier, name);
 }
 
 CannedBrowsingDataDatabaseHelper::~CannedBrowsingDataDatabaseHelper() {}