Eagerly sweep MediaKeySession objects.

Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h

Index: Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
diff --git a/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h b/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
index 6cc7d2c31247f340069868e88d77599d46feb969..9e210715821304b016f87b64ed79cabce0ef7bec 100644
--- a/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
+++ b/Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h
@@ -24,11 +24,8 @@ class ScriptState;
 
 class MODULES_EXPORT HTMLMediaElementEncryptedMedia final : public NoBaseWillBeGarbageCollected<HTMLMediaElementEncryptedMedia>, public WillBeHeapSupplement<HTMLMediaElement> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementEncryptedMedia);
+    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(HTMLMediaElementEncryptedMedia);
 public:
-#if !ENABLE(OILPAN)
-    ~HTMLMediaElementEncryptedMedia();
-#endif
-
     // encrypted media extensions (v0.1b)
     static void webkitGenerateKeyRequest(HTMLMediaElement&, const String& keySystem, PassRefPtr<DOMUint8Array> initData, ExceptionState&);
     static void webkitGenerateKeyRequest(HTMLMediaElement&, const String& keySystem, ExceptionState&);