Simplify use of ContentDecryptionModuleResult with promises

Source/modules/encryptedmedia/SimpleContentDecryptionModuleResultPromise.cpp

Index: Source/modules/encryptedmedia/SimpleContentDecryptionModuleResultPromise.cpp
diff --git a/Source/modules/encryptedmedia/SimpleContentDecryptionModuleResultPromise.cpp b/Source/modules/encryptedmedia/SimpleContentDecryptionModuleResultPromise.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a0a93d3cda753965f1850b6f058d791ae93c352d
--- /dev/null
+++ b/Source/modules/encryptedmedia/SimpleContentDecryptionModuleResultPromise.cpp
@@ -0,0 +1,24 @@
+// 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/SimpleContentDecryptionModuleResultPromise.h"
+
+namespace blink {
+
+SimpleContentDecryptionModuleResultPromise::SimpleContentDecryptionModuleResultPromise(ScriptState* scriptState)
+    : ContentDecryptionModuleResultPromise(scriptState)
+{
+}
+
+SimpleContentDecryptionModuleResultPromise::~SimpleContentDecryptionModuleResultPromise()
+{
+}
+
+void SimpleContentDecryptionModuleResultPromise::complete()
+{
+    resolve();
+}
+
+} // namespace blink