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

components/gcm_driver/gcm_client.cc

 // Copyright 2013 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/gcm_driver/gcm_client.h"
 
 namespace gcm {
 
 GCMClient::ChromeBuildInfo::ChromeBuildInfo()
     : platform(PLATFORM_UNKNOWN),
       channel(CHANNEL_UNKNOWN) {
 }
 
 GCMClient::ChromeBuildInfo::~ChromeBuildInfo() {
 }
 
 GCMClient::SendErrorDetails::SendErrorDetails() : result(UNKNOWN_ERROR) {}
 
+GCMClient::SendErrorDetails::SendErrorDetails(const SendErrorDetails& other) =
+    default;
+
 GCMClient::SendErrorDetails::~SendErrorDetails() {}
 
 GCMClient::GCMStatistics::GCMStatistics()
     : is_recording(false),
       gcm_client_created(false),
       connection_client_created(false),
       android_id(0),
       send_queue_size(0),
       resend_queue_size(0) {
 }
 
+GCMClient::GCMStatistics::GCMStatistics(const GCMStatistics& other) = default;
+
 GCMClient::GCMStatistics::~GCMStatistics() {
 }
 
 GCMClient::GCMClient() {
 }
 
 GCMClient::~GCMClient() {
 }
 
 }  // namespace gcm