Remove createContentDecryptionModule() from platform.h

public/platform/Platform.h

 /*
  * Copyright (C) 2012 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 123 matching lines @@
 
     // May return null on some platforms.
     virtual WebThemeEngine* themeEngine() { return 0; }
 
     virtual WebFallbackThemeEngine* fallbackThemeEngine() { return 0; }
 
     // May return null.
     virtual WebSpeechSynthesizer* createSpeechSynthesizer(WebSpeechSynthesizerClient*) { return 0; }
 
 
-    // Media --------------------------------------------------------------
-
-    // May return null.
-    virtual WebContentDecryptionModule* createContentDecryptionModule(const WebString& keySystem) { return 0; }
-
-
     // Audio --------------------------------------------------------------
 
     virtual double audioHardwareSampleRate() { return 0; }
     virtual size_t audioHardwareBufferSize() { return 0; }
     virtual unsigned audioHardwareOutputChannels() { return 0; }
 
     // Creates a device for audio I/O.
     // Pass in (numberOfInputChannels > 0) if live/local audio input is desired.
     virtual WebAudioDevice* createAudioDevice(size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfChannels, double sampleRate, WebAudioDevice::RenderCallback*, const WebString& deviceId) { return 0; }
 
@@ skipping 479 matching lines @@
     virtual WebDatabaseObserver* databaseObserver() { return 0; }
 
 
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace blink
 
 #endif