Fix MojoCdmPromise resolving.

media/mojo/services/mojo_cdm_promise.cc

 // 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.
 
 #include "media/mojo/services/mojo_cdm_promise.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 22 matching lines @@
 }
 
 template <typename... T>
 MojoCdmPromise<T...>::~MojoCdmPromise() {
   if (!callback_.is_null())
     DVLOG(1) << "Promise not resolved before destruction.";
 }
 
 template <typename... T>
 void MojoCdmPromise<T...>::resolve(const T&... result) {
+  MarkPromiseSettled();
   mojo::CdmPromiseResultPtr cdm_promise_result(mojo::CdmPromiseResult::New());
   cdm_promise_result->success = true;
   callback_.Run(cdm_promise_result.Pass(),
                 MojoTypeTrait<T>::MojoType::From(result)...);
   callback_.reset();
 }
 
 template <typename... T>
 void MojoCdmPromise<T...>::reject(MediaKeys::Exception exception,
                                   uint32_t system_code,
                                   const std::string& error_message) {
+  MarkPromiseSettled();
   callback_.Run(GetRejectResult(exception, system_code, error_message),
                 MojoTypeTrait<T>::DefaultValue()...);
   callback_.reset();
 }
 
 template class MojoCdmPromise<>;
 template class MojoCdmPromise<std::string>;
 
 }  // namespace media