Extract GCMClient data types into separate gcm_types.h

sync/notifier/gcm_network_channel.h

Index: sync/notifier/gcm_network_channel.h
diff --git a/sync/notifier/gcm_network_channel.h b/sync/notifier/gcm_network_channel.h
index 5f86ce768d35e70af24e788f552c3be3642acaed..16bcfc82392cf8138473f6649e57974f132faa9f 100644
--- a/sync/notifier/gcm_network_channel.h
+++ b/sync/notifier/gcm_network_channel.h
@@ -33,14 +33,14 @@ struct GCMNetworkChannelDiagnostic {
 
   // TODO(pavely): Move this toString to a more appropiate place in GCMClient.
   std::string GCMClientResultToString(
-      const gcm::GCMClient::Result result) const;
+      const gcm::Result result) const;
 
   GCMNetworkChannel* parent_;
   bool last_message_empty_echo_token_;
   base::Time last_message_received_time_;
   int last_post_response_code_;
   std::string registration_id_;
-  gcm::GCMClient::Result registration_result_;
+  gcm::Result registration_result_;
   int sent_messages_count_;
 };
 
@@ -87,7 +87,7 @@ class SYNC_EXPORT_PRIVATE GCMNetworkChannel
   friend class GCMNetworkChannelTest;
   void Register();
   void OnRegisterComplete(const std::string& registration_id,
-                          gcm::GCMClient::Result result);
+                          gcm::Result result);
   void RequestAccessToken();
   void OnGetTokenComplete(const GoogleServiceAuthError& error,
                           const std::string& token);