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

chrome/browser/media_galleries/media_galleries_preferences.cc

 // Copyright (c) 2012 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 "chrome/browser/media_galleries/media_galleries_preferences.h"
 
 #include <stddef.h>
 
 #include "base/base_paths_posix.h"
 #include "base/callback.h"
@@ skipping 361 matching lines @@
       type(kInvalidType),
       total_size_in_bytes(0),
       volume_metadata_valid(false),
       audio_count(0),
       image_count(0),
       video_count(0),
       default_gallery_type(kNotDefault),
       prefs_version(0) {
 }
 
+MediaGalleryPrefInfo::MediaGalleryPrefInfo(const MediaGalleryPrefInfo& other) =
+    default;
+
 MediaGalleryPrefInfo::~MediaGalleryPrefInfo() {}
 
 base::FilePath MediaGalleryPrefInfo::AbsolutePath() const {
   base::FilePath base_path = MediaStorageUtil::FindDevicePathById(device_id);
   DCHECK(!path.IsAbsolute());
   return base_path.empty() ? base_path : base_path.Append(path);
 }
 
 bool MediaGalleryPrefInfo::IsBlackListedType() const {
   return type == kBlackListed || type == kRemovedScan;
@@ skipping 1061 matching lines @@
   if (extension_prefs_for_testing_)
     return extension_prefs_for_testing_;
   return extensions::ExtensionPrefs::Get(profile_);
 }
 
 void MediaGalleriesPreferences::SetExtensionPrefsForTesting(
     extensions::ExtensionPrefs* extension_prefs) {
   DCHECK(IsInitialized());
   extension_prefs_for_testing_ = extension_prefs;
 }