media: Reject pending CDM promise during destruction.

media/base/cdm_callback_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/base/cdm_callback_promise.h"
 
+#include "base/callback_helpers.h"
 #include "base/logging.h"
 
 namespace media {
 
 template <typename... T>
 CdmCallbackPromise<T...>::CdmCallbackPromise(
     const base::Callback<void(const T&...)>& resolve_cb,
     const PromiseRejectedCB& reject_cb)
     : resolve_cb_(resolve_cb), reject_cb_(reject_cb) {
   DCHECK(!resolve_cb_.is_null());
   DCHECK(!reject_cb_.is_null());
 }
 
 template <typename... T>
 CdmCallbackPromise<T...>::~CdmCallbackPromise() {
+  if (IsPromiseSettled())
+    return;
+
+  DCHECK(!resolve_cb_.is_null() && !reject_cb_.is_null());
+  RejectPromiseOnDestruction();
 }
 
 template <typename... T>
 void CdmCallbackPromise<T...>::resolve(const T&... result) {
   MarkPromiseSettled();
-  resolve_cb_.Run(result...);
+  base::ResetAndReturn(&resolve_cb_).Run(result...);
 }
 
 template <typename... T>
 void CdmCallbackPromise<T...>::reject(MediaKeys::Exception exception_code,
                                       uint32_t system_code,
                                       const std::string& error_message) {
   MarkPromiseSettled();
-  reject_cb_.Run(exception_code, system_code, error_message);
+  base::ResetAndReturn(&reject_cb_)
+      .Run(exception_code, system_code, error_message);
 }
 
 // Explicit template instantiation for the Promises needed.
 template class MEDIA_EXPORT CdmCallbackPromise<>;
 template class MEDIA_EXPORT CdmCallbackPromise<std::string>;
 
 }  // namespace media