[Chromecast] Add method to CastCdm for the session expiration updating.

components/gcm_driver/instance_id/instance_id_impl.cc

Index: components/gcm_driver/instance_id/instance_id_impl.cc
diff --git a/components/gcm_driver/instance_id/instance_id_impl.cc b/components/gcm_driver/instance_id/instance_id_impl.cc
index 56a0cbed8d2c16e43743480ea3feea22dcd0710c..a0c807bd2a3375fd9b663db3394619828f8fb38d 100644
--- a/components/gcm_driver/instance_id/instance_id_impl.cc
+++ b/components/gcm_driver/instance_id/instance_id_impl.cc
@@ -12,7 +12,6 @@
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/logging.h"
-#include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ -49,13 +48,6 @@ InstanceID::Result GCMClientResultToInstanceIDResult(
 
 }  // namespace
 
-// static
-std::unique_ptr<InstanceID> InstanceID::CreateInternal(
-    const std::string& app_id,
-    gcm::GCMDriver* gcm_driver) {
-  return base::WrapUnique(new InstanceIDImpl(app_id, gcm_driver));
-}
-
 InstanceIDImpl::InstanceIDImpl(const std::string& app_id,
                                gcm::GCMDriver* gcm_driver)
     : InstanceID(app_id, gcm_driver), weak_ptr_factory_(this) {