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

ppapi/proxy/ppb_image_data_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_image_data_proxy.h"
 
 #include <string.h>  // For memcpy
 
 #include <vector>
 
@@ skipping 62 matching lines @@
 #endif
 }
 
 ImageData::~ImageData() {
 }
 
 ::ppapi::thunk::PPB_ImageData_API* ImageData::AsPPB_ImageData_API() {
   return this;
 }
 
-ImageData* ImageData::AsImageData() {
-  return this;
-}
-
 PP_Bool ImageData::Describe(PP_ImageDataDesc* desc) {
   memcpy(desc, &desc_, sizeof(PP_ImageDataDesc));
   return PP_TRUE;
 }
 
 void* ImageData::Map() {
   if (!mapped_canvas_.get()) {
     mapped_canvas_.reset(transport_dib_->GetPlatformCanvas(desc_.size.width,
                                                            desc_.size.height));
     if (!mapped_canvas_.get())
@@ skipping 32 matching lines @@
     return reinterpret_cast<ImageHandle>(i);
 #elif defined(OS_MACOSX)
     return ImageHandle(i, false);
 #else
     return static_cast<ImageHandle>(i);
 #endif
 }
 
 }  // namespace proxy
 }  // namespace pp