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

components/invalidation/public/invalidation.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/invalidation.h"
 
 #include <cstddef>
 
 #include "base/bind.h"
 #include "base/json/json_string_value_serializer.h"
@@ skipping 68 matching lines @@
     return scoped_ptr<Invalidation>();
   }
   return scoped_ptr<Invalidation>(new Invalidation(
       id,
       false,
       version,
       payload,
       AckHandle::CreateUnique()));
 }
 
+Invalidation::Invalidation(const Invalidation& other) = default;
+
 Invalidation::~Invalidation() {
 }
 
 invalidation::ObjectId Invalidation::object_id() const {
   return id_;
 }
 
 bool Invalidation::is_unknown_version() const {
   return is_unknown_version_;
 }
@@ skipping 70 matching lines @@
                            int64_t version,
                            const std::string& payload,
                            AckHandle ack_handle)
     : id_(id),
       is_unknown_version_(is_unknown_version),
       version_(version),
       payload_(payload),
       ack_handle_(ack_handle) {}
 
 }  // namespace syncer