Simplify use of ContentDecryptionModuleResult with promises

Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/DOMTypedArray.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/MediaKeyError.h"
 #include "core/html/MediaKeyEvent.h"
+#include "modules/encryptedmedia/ContentDecryptionModuleResultPromise.h"
 #include "modules/encryptedmedia/MediaEncryptedEvent.h"
 #include "modules/encryptedmedia/MediaKeys.h"
-#include "modules/encryptedmedia/SimpleContentDecryptionModuleResult.h"
 #include "platform/ContentDecryptionModuleResult.h"
 #include "platform/Logging.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/Functional.h"
 
 namespace blink {
 
 static void throwExceptionIfMediaKeyExceptionOccurred(const String& keySystem, const String& sessionId, WebMediaPlayer::MediaKeyException exception, ExceptionState& exceptionState)
 {
     switch (exception) {
@@ skipping 511 matching lines @@
     return thisElement.contentDecryptionModule();
 }
 
 void HTMLMediaElementEncryptedMedia::trace(Visitor* visitor)
 {
     visitor->trace(m_mediaKeys);
     WillBeHeapSupplement<HTMLMediaElement>::trace(visitor);
 }
 
 } // namespace blink