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

components/gcm_driver/instance_id/instance_id.h

Index: components/gcm_driver/instance_id/instance_id.h
diff --git a/components/gcm_driver/instance_id/instance_id.h b/components/gcm_driver/instance_id/instance_id.h
index 1e6c120d202fe3a082149ce9753c7d662ea86647..9e8e9439847295e7863b4199c1e7b3ee260502be 100644
--- a/components/gcm_driver/instance_id/instance_id.h
+++ b/components/gcm_driver/instance_id/instance_id.h
@@ -66,13 +66,6 @@ class InstanceID {
 
   static const int kInstanceIDByteLength = 8;
 
-  // Creator. Should only be used by InstanceIDDriver::GetInstanceID.
-  // |app_id|: identifies the application that uses the Instance ID.
-  // |handler|: provides the GCM functionality needed to support Instance ID.
-  //            Must outlive this class. On Android, this can be null instead.
-  static std::unique_ptr<InstanceID> CreateInternal(const std::string& app_id,
-                                                    gcm::GCMDriver* gcm_driver);
-
   virtual ~InstanceID();
 
   // Sets the callback that will be invoked when the token refresh event needs