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

components/security_interstitials/core/metrics_helper.h

 // 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.
 
 #ifndef COMPONENTS_SECURITY_INTERSTITIALS_CORE_METRICS_HELPER_H_
 #define COMPONENTS_SECURITY_INTERSTITIALS_CORE_METRICS_HELPER_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 49 matching lines @@
   //                examples: "phishing", "ssl_overridable"
   // extra_suffix: If not-empty, will generate second set of metrics by
   //               placing at the end of the metric name.  Examples:
   //               "from_datasaver", "from_device"
   // rappor_prefix: Metric prefix for Rappor.
   //                examples: "phishing", "ssl2"
   // rappor_report_type: Used to differentiate UMA and Safe Browsing statistics.
   // The rappor preferences can be left blank if rappor_service is not set.
   struct ReportDetails {
     ReportDetails();
+    ReportDetails(const ReportDetails& other);
     std::string metric_prefix;
     std::string extra_suffix;
     std::string rappor_prefix;
     rappor::RapporType rappor_report_type;
   };
 
   // Args:
   //   url: URL of page that triggered the interstitial. Only origin is used.
   //   history_service: Set this to record metrics based on whether the user
   //                    has visited this hostname before.
@@ skipping 37 matching lines @@
   rappor::RapporService* rappor_service_;
   int num_visits_;
   base::CancelableTaskTracker request_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(MetricsHelper);
 };
 
 }  // namespace security_interstitials
 
 #endif  // COMPONENTS_SECURITY_INTERSTITIALS_CORE_METRICS_HELPER_H_