Remove unused createContentDecryptionModule() code.

content/renderer/renderer_webkitplatformsupport_impl.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
@@ skipping 102 matching lines @@
 
   virtual blink::WebAudioDevice* createAudioDevice(
       size_t buffer_size, unsigned input_channels, unsigned channels,
       double sample_rate, blink::WebAudioDevice::RenderCallback* callback,
       const blink::WebString& input_device_id);
 
   virtual bool loadAudioResource(
       blink::WebAudioBus* destination_bus, const char* audio_file_data,
       size_t data_size);
 
-  virtual blink::WebContentDecryptionModule* createContentDecryptionModule(
-      const blink::WebString& key_system);
   virtual blink::WebMIDIAccessor*
       createMIDIAccessor(blink::WebMIDIAccessorClient* client);
 
   virtual blink::WebBlobRegistry* blobRegistry();
   virtual void sampleGamepads(blink::WebGamepads&) OVERRIDE;
   virtual void setGamepadListener(blink::WebGamepadListener*) OVERRIDE;
   virtual blink::WebRTCPeerConnectionHandler* createRTCPeerConnectionHandler(
       blink::WebRTCPeerConnectionHandlerClient* client);
   virtual blink::WebMediaStreamCenter* createMediaStreamCenter(
       blink::WebMediaStreamCenterClient* client);
@@ skipping 104 matching lines @@
   scoped_ptr<ScreenOrientationDispatcher> screen_orientation_dispatcher_;
 
   scoped_ptr<blink::WebScrollbarBehavior> web_scrollbar_behavior_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererWebKitPlatformSupportImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDERER_WEBKITPLATFORMSUPPORT_IMPL_H_