Change back to destroy the CDM synchronously

media/blink/cdm_session_adapter.cc

Index: media/blink/cdm_session_adapter.cc
diff --git a/media/blink/cdm_session_adapter.cc b/media/blink/cdm_session_adapter.cc
index 0a743e08ef305df411f4a6b12d6a6ca7676793ba..2350ba246745f0f0118035a54961537fa410b659 100644
--- a/media/blink/cdm_session_adapter.cc
+++ b/media/blink/cdm_session_adapter.cc
@@ -26,26 +26,12 @@ namespace {
 const char kMediaEME[] = "Media.EME.";
 const char kDot[] = ".";
 const char kTimeToCreateCdmUMAName[] = "CreateCdmTime";
-
-void ReleaseCdm(scoped_refptr<MediaKeys> cdm) {
-  // |cdm| will be freed now.
-}
-
 }  // namespace
 
 CdmSessionAdapter::CdmSessionAdapter()
     : trace_id_(0), weak_ptr_factory_(this) {}
 
-CdmSessionAdapter::~CdmSessionAdapter() {
-  // Freeing |cdm_| may take a while, so post a task to do it asynchronously.
-  // Note that freeing the CDM will cause any unfullfilled promises to be
-  // rejected, and that needs to be done outside of blink gc (which most
-  // likely triggered our destruction).
-  if (cdm_) {
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::Bind(&ReleaseCdm, cdm_));
-  }
-}
+CdmSessionAdapter::~CdmSessionAdapter() {}
 
 void CdmSessionAdapter::CreateCdm(
     CdmFactory* cdm_factory,