Extract GCMClient data types into separate gcm_types.h

google_apis/gcm/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 "google_apis/gcm/gcm_client.h"
 
 namespace gcm {
 
-GCMClient::OutgoingMessage::OutgoingMessage()
-    : time_to_live(0) {
-}
-
-GCMClient::OutgoingMessage::~OutgoingMessage() {
-}
-
-GCMClient::IncomingMessage::IncomingMessage() {
-}
-
-GCMClient::IncomingMessage::~IncomingMessage() {
-}
-
-GCMClient::SendErrorDetails::SendErrorDetails() : result(UNKNOWN_ERROR) {}
-
-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() {
 }
 
 GCMClient::GCMClient() {
 }
 
 GCMClient::~GCMClient() {
 }
 
 }  // namespace gcm