media: Reject pending CDM promise during destruction.

chromecast/media/cdm/browser_cdm_cast.cc

Index: chromecast/media/cdm/browser_cdm_cast.cc
diff --git a/chromecast/media/cdm/browser_cdm_cast.cc b/chromecast/media/cdm/browser_cdm_cast.cc
index 380c3622b71c239169a4b98772ee907af4ea2a5b..e5585c5ac17de7d89ae83edfc7de172ba0c38580 100644
--- a/chromecast/media/cdm/browser_cdm_cast.cc
+++ b/chromecast/media/cdm/browser_cdm_cast.cc
@@ -29,8 +29,11 @@ class CdmPromiseInternal : public ::media::CdmPromiseTemplate<T...> {
         promise_(std::move(promise)) {}
 
   ~CdmPromiseInternal() final {
-    // Promise must be resolved or rejected before destruction.
-    DCHECK(!promise_);
+    if (IsPromiseSettled())
+      return;
+
+    DCHECK(promise_);
+    RejectPromiseOnDestruction();
   }
 
   // CdmPromiseTemplate<> implementation.
@@ -48,7 +51,9 @@ class CdmPromiseInternal : public ::media::CdmPromiseTemplate<T...> {
   }
 
  private:
+  using ::media::CdmPromiseTemplate<T...>::IsPromiseSettled;
   using ::media::CdmPromiseTemplate<T...>::MarkPromiseSettled;
+  using ::media::CdmPromiseTemplate<T...>::RejectPromiseOnDestruction;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_ptr<::media::CdmPromiseTemplate<T...>> promise_;