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

components/content_settings/core/browser/content_settings_rule.cc

 // Copyright (c) 2011 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 "base/logging.h"
 #include "components/content_settings/core/browser/content_settings_rule.h"
 
 namespace content_settings {
 
 Rule::Rule() {}
 
 Rule::Rule(
     const ContentSettingsPattern& primary_pattern,
     const ContentSettingsPattern& secondary_pattern,
     base::Value* value)
     : primary_pattern(primary_pattern),
       secondary_pattern(secondary_pattern),
       value(value) {
   DCHECK(value);
 }
 
+Rule::Rule(const Rule& other) = default;
+
 Rule::~Rule() {}
 
 RuleIterator::~RuleIterator() {}
 
 EmptyRuleIterator::~EmptyRuleIterator() {}
 
 bool EmptyRuleIterator::HasNext() const {
   return false;
 }
 
@@ skipping 25 matching lines @@
   auto current_iterator = iterators_.begin();
   DCHECK(current_iterator != iterators_.end());
   DCHECK((*current_iterator)->HasNext());
   const Rule& to_return = (*current_iterator)->Next();
   if (!(*current_iterator)->HasNext())
     iterators_.erase(current_iterator);
   return to_return;
 }
 
 }  // namespace content_settings