Simplify use of ContentDecryptionModuleResult with promises

Source/modules/encryptedmedia/SimpleContentDecryptionModuleResultPromise.h

+// 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.
+
+#ifndef SimpleContentDecryptionModuleResultPromise_h
+#define SimpleContentDecryptionModuleResultPromise_h
+
+#include "modules/encryptedmedia/ContentDecryptionModuleResultPromise.h"
+
+namespace blink {
+
+// This class creates a simple ContentDecryptionModuleResultPromise where the
+// implementation of complete() will resolve the promise. All other complete()
+// methods will reject the promise.

[ddorwin, 2014/11/11 22:44:09]

nit: Perhaps better to say that they should not be used. This _could_ be
interpreted as saying they should be called to reject.

[jrummell, 2014/11/11 23:30:11]

Done.

+class SimpleContentDecryptionModuleResultPromise : public ContentDecryptionModuleResultPromise {
+public:
+    explicit SimpleContentDecryptionModuleResultPromise(ScriptState*);
+    virtual ~SimpleContentDecryptionModuleResultPromise();
+
+    // ContentDecryptionModuleResult implementation.

[ddorwin, 2014/11/11 22:44:09]

ContentDecryptionModuleResultPromise?

[jrummell, 2014/11/11 23:30:11]

Done.

+    virtual void complete() override;
+};
+
+} // namespace blink
+
+#endif // SimpleContentDecryptionModuleResultPromise_h