Refactor ResourceHandler API.

content/browser/loader/detachable_resource_handler.h

 // Copyright 2013 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 CONTENT_BROWSER_LOADER_DETACHABLE_RESOURCE_HANDLER_H_
 #define CONTENT_BROWSER_LOADER_DETACHABLE_RESOURCE_HANDLER_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 31 matching lines @@
 
   bool is_detached() const { return next_handler_ == NULL; }
   void Detach();
 
   void set_cancel_delay(base::TimeDelta cancel_delay) {
     cancel_delay_ = cancel_delay;
   }
 
   // ResourceHandler implementation:
   void SetController(ResourceController* controller) override;
-  bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
+  void OnRequestRedirected(const net::RedirectInfo& redirect_info,
                            ResourceResponse* response,
-                           bool* defer) override;
-  bool OnResponseStarted(ResourceResponse* response, bool* defer) override;
-  bool OnWillStart(const GURL& url, bool* defer) override;
+                           bool* defer_or_cancel) override;
+  void OnResponseStarted(ResourceResponse* response,
+                         bool* defer_or_cancel) override;
+  void OnWillStart(const GURL& url, bool* defer_or_cancel) override;
   bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
                   int* buf_size,
                   int min_size) override;
-  bool OnReadCompleted(int bytes_read, bool* defer) override;
+  void OnReadCompleted(int bytes_read, bool* defer_or_cancel) override;
   void OnResponseCompleted(const net::URLRequestStatus& status,
                            bool* defer) override;
   void OnDataDownloaded(int bytes_downloaded) override;
 
   // ResourceController implementation:
   void Resume() override;
   void Cancel() override;
   void CancelAndIgnore() override;
   void CancelWithError(int error_code) override;
 
  private:
   std::unique_ptr<ResourceHandler> next_handler_;
   scoped_refptr<net::IOBuffer> read_buffer_;
 
   std::unique_ptr<base::OneShotTimer> detached_timer_;
   base::TimeDelta cancel_delay_;
 
   bool is_deferred_;
   bool is_finished_;
+  bool is_canceled_;
 
   DISALLOW_COPY_AND_ASSIGN(DetachableResourceHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_DETACHABLE_RESOURCE_HANDLER_H_