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

components/content_settings/core/common/content_settings.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 "components/content_settings/core/common/content_settings.h"
 
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/stl_util.h"
@@ skipping 69 matching lines @@
     : primary_pattern(primary_pattern),
       secondary_pattern(secondary_pattern),
       setting(setting),
       source(source),
       incognito(incognito) {}
 
 ContentSettingPatternSource::ContentSettingPatternSource()
     : setting(CONTENT_SETTING_DEFAULT), incognito(false) {
 }
 
+ContentSettingPatternSource::ContentSettingPatternSource(
+    const ContentSettingPatternSource& other) = default;
+
 RendererContentSettingRules::RendererContentSettingRules() {}
 
 RendererContentSettingRules::~RendererContentSettingRules() {}