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

components/invalidation/public/object_id_invalidation_map.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/invalidation/public/object_id_invalidation_map.h"
 
 #include <stddef.h>
 
 #include "base/json/json_string_value_serializer.h"
 
 namespace syncer {
 
 // static
 ObjectIdInvalidationMap ObjectIdInvalidationMap::InvalidateAll(
     const ObjectIdSet& ids) {
   ObjectIdInvalidationMap invalidate_all;
   for (ObjectIdSet::const_iterator it = ids.begin(); it != ids.end(); ++it) {
     invalidate_all.Insert(Invalidation::InitUnknownVersion(*it));
   }
   return invalidate_all;
 }
 
 ObjectIdInvalidationMap::ObjectIdInvalidationMap() {}
 
+ObjectIdInvalidationMap::ObjectIdInvalidationMap(
+    const ObjectIdInvalidationMap& other) = default;
+
 ObjectIdInvalidationMap::~ObjectIdInvalidationMap() {}
 
 ObjectIdSet ObjectIdInvalidationMap::GetObjectIds() const {
   ObjectIdSet ret;
   for (IdToListMap::const_iterator it = map_.begin(); it != map_.end(); ++it) {
     ret.insert(it->first);
   }
   return ret;
 }
 
@@ skipping 79 matching lines @@
   JSONStringValueSerializer serializer(&output);
   serializer.set_pretty_print(true);
   serializer.Serialize(*ToValue().get());
   return output;
 }
 
 ObjectIdInvalidationMap::ObjectIdInvalidationMap(const IdToListMap& map)
   : map_(map) {}
 
 }  // namespace syncer