Implement MediaKeySession close() and remove()

LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release-noreference.html

Index: LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release-noreference.html
diff --git a/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release-noreference.html b/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release-noreference.html
index 22614d294807b250d829fe964fbe6806e65f9e65..c006fd731a32e73367888d98ef010d5081d9c3f6 100644
--- a/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release-noreference.html
+++ b/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release-noreference.html
@@ -56,10 +56,10 @@
                     // Should be just the 2 MediaKeySessions.
                     assert_equals(numActiveDOMObjectsCreated(), 2, 'After gc()');
 
-                    // Release the sessions. Once the close() event is received,
+                    // Close the sessions. Once the close() event is received,
                     // they should get garbage collected as there are no JS
                     // references to them.
-                    var promise = mediaKeySession1.release();
+                    var promise = mediaKeySession1.close();
                     mediaKeySession1 = null;
                     return promise;
                 }).then(function(result) {
@@ -71,7 +71,7 @@
                 }).then(function(result) {
                     // Should be just mediaKeySession2.
                     assert_equals(numActiveDOMObjectsCreated(), 1);
-                    var promise = mediaKeySession2.release();
+                    var promise = mediaKeySession2.close();
                     mediaKeySession2 = null;
                     return promise;
                 }).then(function(result) {