Make ScriptPromiseResolver RefCountedWillBeRefCountedGarbageCollected.

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 0447f54e559d680d26651fe4bf6480803d9afcfd..7e57a95848e51bbf415735ff03dae5ea2fb0b58f 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
@@ -36,20 +36,36 @@
                     mediaKeys = result;
 
                     // Verify MediaKeys are not an ActiveDOMObject.
-                    assert_equals(numActiveDOMObjectsCreated(), 0, 'MediaKeys.create()');
+                    // In non-Oilpan, numActiveDOMObjectsCreate() == 0.
+                    // In Oilpan, numActiveDOMObjectsCreate() <= 2.
+                    // (1 MediaKeysInitializer and
+                    //  1 MediaKeySystemAccessInitializer).
+                    assert_less_than_equal(numActiveDOMObjectsCreated(), 2, 'MediaKeys.create()');
 
                     mediaKeySession1 = mediaKeys.createSession();
                     return mediaKeySession1.generateRequest(initDataType, initData);
                 }).then(function() {
                     assert_true(mediaKeySession1.sessionId && mediaKeySession1.sessionId.length > 0);
                     // Should be 1 MediaKeySession.
-                    assert_equals(numActiveDOMObjectsCreated(), 1, 'mediaKeys.createSession(1)');
+                    // In non-Oilpan, numActiveDOMObjectsCreate() == 1.
+                    // In Oilpan, numActiveDOMObjectsCreate() <= 4.
+                    // (1 MediaKeysInitializer,
+                    //  1 MediaKeySystemAccessInitializer,
+                    //  1 ContentDecryptionModuleResultPromise and
+                    //  1 MediaKeySession).
+                    assert_less_than_equal(numActiveDOMObjectsCreated(), 4, 'MediaKeys.createSession(1)');
                     mediaKeySession2 = mediaKeys.createSession();
                     return mediaKeySession2.generateRequest(initDataType, initData);
                 }).then(function() {
                     assert_true(mediaKeySession2.sessionId && mediaKeySession2.sessionId.length > 0);
                     // Should be 2 MediaKeySessions.
-                    assert_equals(numActiveDOMObjectsCreated(), 2, 'mediaKeys.createSession(2)');
+                    // In non-Oilpan, numActiveDOMObjectsCreate() == 2.
+                    // In Oilpan, numActiveDOMObjectsCreate() <= 6.
+                    // (1 MediaKeysInitializer,
+                    //  1 MediaKeySystemAccessInitializer,
+                    //  2 ContentDecryptionModuleResultPromise and
+                    //  2 MediaKeySession).
+                    assert_less_than_equal(numActiveDOMObjectsCreated(), 6, 'mediaKeys.createSession(2)');
                 }).then(function(result) {
                     // Run gc(). All sessions should remain as we have a
                     // reference to each one.