Remove unused createContentDecryptionModule() code.

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index 14d92bf75fe52bee9bc38e345a3d4b80a5a83c9a..6e8d08386afe1d450722b402b9f5ca46c4c3a1e2 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -799,14 +799,6 @@ bool RendererWebKitPlatformSupportImpl::loadAudioResource(
 
 //------------------------------------------------------------------------------
 
-blink::WebContentDecryptionModule*
-RendererWebKitPlatformSupportImpl::createContentDecryptionModule(
-    const blink::WebString& key_system) {
-  return WebContentDecryptionModuleImpl::Create(key_system);
-}
-
-//------------------------------------------------------------------------------
-
 blink::WebMIDIAccessor*
 RendererWebKitPlatformSupportImpl::createMIDIAccessor(
     blink::WebMIDIAccessorClient* client) {