Remove the old type system for proxied resources. These were no longer being used.

ppapi/proxy/ppb_buffer_proxy.cc

 // Copyright (c) 2011 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/ppb_buffer_proxy.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 27 matching lines @@
       shm_(shm_handle, false),
       size_(size),
       mapped_data_(NULL),
       map_count_(0) {
 }
 
 Buffer::~Buffer() {
   Unmap();
 }
 
-Buffer* Buffer::AsBuffer() {
-  return this;
-}
-
 ppapi::thunk::PPB_Buffer_API* Buffer::AsPPB_Buffer_API() {
   return this;
 }
 
 PP_Bool Buffer::Describe(uint32_t* size_in_bytes) {
   *size_in_bytes = size_;
   return PP_TRUE;
 }
 
 PP_Bool Buffer::IsMapped() {
@@ skipping 100 matching lines @@
 #elif defined(OS_POSIX)
       local_fd;
 #else
   #error Not implemented.
 #endif
   *result_shm_handle = dispatcher->ShareHandleWithRemote(platform_file, false);
 }
 
 }  // namespace proxy
 }  // namespace pp