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

components/security_interstitials/core/metrics_helper.cc

 // Copyright 2015 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 "components/security_interstitials/core/metrics_helper.h"
 
 #include <utility>
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/user_metrics.h"
@@ skipping 90 matching lines @@
     if (metric_name == "bad_clock")
       RecordAction(UserMetricsAction("BadClockInterstitial.Settings"));
   }
 }
 
 }  // namespace
 
 MetricsHelper::ReportDetails::ReportDetails()
     : rappor_report_type(rappor::NUM_RAPPOR_TYPES) {}
 
+MetricsHelper::ReportDetails::ReportDetails(const ReportDetails& other) =
+    default;
+
 MetricsHelper::MetricsHelper(const GURL& request_url,
                              const ReportDetails settings,
                              history::HistoryService* history_service,
                              rappor::RapporService* rappor_service)
     : request_url_(request_url),
       settings_(settings),
       rappor_service_(rappor_service),
       num_visits_(-1) {
   DCHECK(!settings_.metric_prefix.empty());
   if (settings_.rappor_report_type == rappor::NUM_RAPPOR_TYPES)  // Default.
@@ skipping 85 matching lines @@
 }
 
 void MetricsHelper::OnGotHistoryCount(bool success,
                                       int num_visits,
                                       base::Time /*first_visit*/) {
   if (success)
     num_visits_ = num_visits;
 }
 
 }  // namespace security_interstitials