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

components/gcm_driver/instance_id/instance_id_android.cc

Index: components/gcm_driver/instance_id/instance_id_android.cc
diff --git a/components/gcm_driver/instance_id/instance_id_android.cc b/components/gcm_driver/instance_id/instance_id_android.cc
index e51c178f118fa206b5a6ec725e1927080adeb409..75d5b7c9a9865d05020c98df960179d71969e8e5 100644
--- a/components/gcm_driver/instance_id/instance_id_android.cc
+++ b/components/gcm_driver/instance_id/instance_id_android.cc
@@ -38,13 +38,6 @@ InstanceIDAndroid::ScopedBlockOnAsyncTasksForTesting::
   Java_InstanceIDBridge_setBlockOnAsyncTasksForTesting(env, previous_value_);
 }
 
-// static
-std::unique_ptr<InstanceID> InstanceID::CreateInternal(
-    const std::string& app_id,
-    gcm::GCMDriver* gcm_driver) {
-  return base::WrapUnique(new InstanceIDAndroid(app_id, gcm_driver));
-}
-
 InstanceIDAndroid::InstanceIDAndroid(const std::string& app_id,
                                      gcm::GCMDriver* gcm_driver)
     : InstanceID(app_id, gcm_driver) {