Change URLRequest to use a ref-counted buffer for actual IO....

chrome/browser/renderer_host/async_resource_handler.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_
 
 #include "base/process.h"
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 #include "chrome/browser/renderer_host/resource_handler.h"
 
-namespace base {
-class SharedMemory;
-}
+class SharedIOBuffer;
 
 // Used to complete an asynchronous resource request in response to resource
 // load events from the resource dispatcher host.
 class AsyncResourceHandler : public ResourceHandler {
  public:
   AsyncResourceHandler(ResourceDispatcherHost::Receiver* receiver,
                        int render_process_host_id,
                        int routing_id,
                        base::ProcessHandle render_process,
                        const GURL& url,
                        ResourceDispatcherHost* resource_dispatcher_host);
 
   // ResourceHandler implementation:
   bool OnUploadProgress(int request_id, uint64 position, uint64 size);
   bool OnRequestRedirected(int request_id, const GURL& new_url);
   bool OnResponseStarted(int request_id, ResourceResponse* response);
-  bool OnWillRead(int request_id, char** buf, int* buf_size, int min_size);
+  bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
+                  int min_size);
   bool OnReadCompleted(int request_id, int* bytes_read);
   bool OnResponseCompleted(int request_id, const URLRequestStatus& status);
 
   static void GlobalCleanup();
 
  private:
   // When reading, we don't know if we are going to get EOF (0 bytes read), so
   // we typically have a buffer that we allocated but did not use.  We keep
   // this buffer around for the next read as a small optimization.
-  static base::SharedMemory* spare_read_buffer_;
+  static SharedIOBuffer* spare_read_buffer_;
 
-  scoped_ptr<base::SharedMemory> read_buffer_;
+  scoped_refptr<SharedIOBuffer> read_buffer_;
   ResourceDispatcherHost::Receiver* receiver_;
   int render_process_host_id_;
   int routing_id_;
   base::ProcessHandle render_process_;
   ResourceDispatcherHost* rdh_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_ASYNC_RESOURCE_HANDLER_H_