Fix MojoCdmPromise resolving.

media/mojo/services/mojo_cdm_promise.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_MOJO_SERVICES_MOJO_CDM_PROMISE_H_
 #define MEDIA_MOJO_SERVICES_MOJO_CDM_PROMISE_H_
 
 #include "base/macros.h"
 #include "media/base/cdm_promise.h"
 #include "media/mojo/interfaces/content_decryption_module.mojom.h"
@@ skipping 13 matching lines @@
   MojoCdmPromise(const CallbackType& callback);
   ~MojoCdmPromise() final;
 
   // CdmPromiseTemplate<> implementation.
   void resolve(const T&... result) final;
   void reject(MediaKeys::Exception exception,
               uint32_t system_code,
               const std::string& error_message) final;
 
  private:
+  using media::CdmPromiseTemplate<T...>::MarkPromiseSettled;
+
   CallbackType callback_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_PROMISE_H_