Delete some unused code found by -Wunused-function

ppapi/proxy/ppp_content_decryptor_private_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppp_content_decryptor_private_proxy.h"
 
 #include "base/platform_file.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/ppb_core.h"
 #include "ppapi/proxy/content_decryptor_private_serializer.h"
@@ skipping 219 matching lines @@
 }
 
 static const PPP_ContentDecryptor_Private content_decryptor_interface = {
   &GenerateKeyRequest,
   &AddKey,
   &CancelKeyRequest,
   &Decrypt,
   &DecryptAndDecode
 };
 
-InterfaceProxy* CreateContentDecryptorPPPProxy(Dispatcher* dispatcher) {
-  return new PPP_ContentDecryptor_Private_Proxy(dispatcher);
-}
-
 }  // namespace
 
 PPP_ContentDecryptor_Private_Proxy::PPP_ContentDecryptor_Private_Proxy(
     Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher),
       ppp_decryptor_impl_(NULL) {
   if (dispatcher->IsPlugin()) {
     ppp_decryptor_impl_ = static_cast<const PPP_ContentDecryptor_Private*>(
         dispatcher->local_get_interface()(
             PPP_CONTENTDECRYPTOR_PRIVATE_INTERFACE));
@@ skipping 98 matching lines @@
       return;
     CallWhileUnlocked(ppp_decryptor_impl_->DecryptAndDecode,
                       instance,
                       plugin_resource,
                       const_cast<const PP_EncryptedBlockInfo*>(&block_info));
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi