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

components/history/core/browser/url_row.cc

 // Copyright 2014 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/history/core/browser/url_row.h"
 
 #include <algorithm>
 
 namespace history {
 
 URLRow::URLRow() {
   Initialize();
 }
 
 URLRow::URLRow(const GURL& url) : url_(url) {
   // Initialize will not set the URL, so our initialization above will stay.
   Initialize();
 }
 
 URLRow::URLRow(const GURL& url, URLID id) : url_(url) {
   // Initialize will not set the URL, so our initialization above will stay.
   Initialize();
   // Initialize will zero the id_, so set it here.
   id_ = id;
 }
 
+URLRow::URLRow(const URLRow& other) = default;
+
 URLRow::~URLRow() {
 }
 
 URLRow& URLRow::operator=(const URLRow& other) {
   if (this == &other)
     return *this;
   id_ = other.id_;
   url_ = other.url_;
   title_ = other.title_;
   visit_count_ = other.visit_count_;
@@ skipping 35 matching lines @@
 URLResult::URLResult(const GURL& url,
                      const query_parser::Snippet::MatchPositions& title_matches)
     : URLRow(url) {
   title_match_positions_ = title_matches;
 }
 URLResult::URLResult(const URLRow& url_row)
     : URLRow(url_row),
       blocked_visit_(false) {
 }
 
+URLResult::URLResult(const URLResult& other) = default;
+
 URLResult::~URLResult() {
 }
 
 void URLResult::SwapResult(URLResult* other) {
   URLRow::Swap(other);
   std::swap(visit_time_, other->visit_time_);
   snippet_.Swap(&other->snippet_);
   title_match_positions_.swap(other->title_match_positions_);
   std::swap(blocked_visit_, other->blocked_visit_);
 }
 
 // static
 bool URLResult::CompareVisitTime(const URLResult& lhs, const URLResult& rhs) {
   return lhs.visit_time() > rhs.visit_time();
 }
 
 }  // namespace history