Revert 86802 - Remove ProtocolFactory/Interceptor uses in GViewRequestInterceptor.

chrome/browser/chromeos/gview_request_interceptor.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2009 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_CHROMEOS_GVIEW_REQUEST_INTERCEPTOR_H__
 #define CHROME_BROWSER_CHROMEOS_GVIEW_REQUEST_INTERCEPTOR_H__
 #pragma once
 
 #include <string>
 #include "base/hash_tables.h"
-#include "net/url_request/url_request_job_factory.h"
+#include "net/url_request/url_request.h"
+
+template <typename T> struct DefaultSingletonTraits;
 
 namespace chromeos {
 
 // This class integrates the Google Document Viewer into ChromeOS,
 // enabling the viewing of supported document types that the user
 // clicks on.  This class will intercept requests to supported
 // document types (such as PDF) and redirect the request to the Google
 // Document Viewer, including the document's original URL as a
 // parameter.
-class GViewRequestInterceptor : public net::URLRequestJobFactory::Interceptor {
+class GViewRequestInterceptor : public net::URLRequest::Interceptor {
  public:
-  GViewRequestInterceptor();
-  virtual ~GViewRequestInterceptor();
-
   // Always returns NULL because we don't want to attempt a redirect
   // before seeing the detected mime type of the request.
-  virtual net::URLRequestJob* MaybeIntercept(net::URLRequest* request) const;
-
-  // Always returns NULL.
-  virtual net::URLRequestJob* MaybeInterceptRedirect(
-      const GURL& location,
-      net::URLRequest* request) const;
+  virtual net::URLRequestJob* MaybeIntercept(net::URLRequest* request);
 
   // Determines if the requested document can be viewed by the Google
   // Document Viewer.  If it can, returns a net::URLRequestJob that
   // redirects the browser to the view URL.
-  virtual net::URLRequestJob* MaybeInterceptResponse(
-      net::URLRequest* request) const;
+  virtual net::URLRequestJob* MaybeInterceptResponse(net::URLRequest* request);
+
+  // Singleton accessor.
+  static GViewRequestInterceptor* GetInstance();
 
  private:
+  friend struct DefaultSingletonTraits<GViewRequestInterceptor>;
+
+  GViewRequestInterceptor();
+  virtual ~GViewRequestInterceptor();
+
   // The list of supported mime types.
   base::hash_set<std::string> supported_mime_types_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_GVIEW_REQUEST_INTERCEPTOR_H__