Verify MediaKeys parameter values consistently

Source/platform/drm/ContentDecryptionModule.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class ContentDecryptionModuleSession;
 class ContentDecryptionModuleSessionClient;
 
 class PLATFORM_EXPORT ContentDecryptionModule {
     WTF_MAKE_NONCOPYABLE(ContentDecryptionModule);
 public:
-    static bool supportsKeySystem(const String&);
     static PassOwnPtr<ContentDecryptionModule> create(const String& keySystem);
 
     ContentDecryptionModule(PassOwnPtr<blink::WebContentDecryptionModule>);
     ~ContentDecryptionModule();
 
     // ContentDecryptionModule
-    bool supportsMIMEType(const String&);
     PassOwnPtr<ContentDecryptionModuleSession> createSession(ContentDecryptionModuleSessionClient*);
 
     blink::WebContentDecryptionModule* contentDecryptionModule() { return m_cdm.get(); }
 
 private:
     OwnPtr<blink::WebContentDecryptionModule> m_cdm;
 };
 
 } // namespace WebCore
 
 #endif // ContentDecryptionModule_h