Make URLRequestHttpJob the only URLRequestJob concerned with FilterContext.

net/url_request/url_request_job.h

 // 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.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_JOB_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 97 matching lines @@
 
   // Called to get response info.
   virtual void GetResponseInfo(net::HttpResponseInfo* info);
 
   // Returns the cookie values included in the response, if applicable.
   // Returns true if applicable.
   // NOTE: This removes the cookies from the job, so it will only return
   //       useful results once per job.
   virtual bool GetResponseCookies(std::vector<std::string>* cookies);
 
-  // Called to fetch the encoding types for this request. Only makes sense for
-  // some types of requests. Returns true on success. Calling this on a request
-  // that doesn't have or specify an encoding type will return false.
-  // Returns a array of strings showing the sequential encodings used on the
-  // content.
-  // For example, encoding_types[0] = FILTER_TYPE_SDCH and encoding_types[1] =
-  // FILTER_TYPE_GZIP, means the content was first encoded by sdch, and then
-  // result was encoded by gzip.  To decode, a series of filters must be applied
-  // in the reverse order (in the above example, ungzip first, and then sdch
-  // expand).
-  virtual bool GetContentEncodings(
-      std::vector<Filter::FilterType>* encoding_types);
-
-  // Called to setup stream filter for this request. An example of filter is
+  // Called to setup a stream filter for this request. An example of filter is
   // content encoding/decoding.
-  void SetupFilter();
+  // Subclasses should return the appropriate Filter, or NULL for no Filter.
+  // This class takes ownership of the returned Filter.
+  //
+  // The default implementation returns NULL.
+  virtual Filter* SetupFilter() const;
 
   // Called to determine if this response is a redirect.  Only makes sense
   // for some types of requests.  This method returns true if the response
   // is a redirect, and fills in the location param with the URL of the
   // redirect.  The HTTP status code (e.g., 302) is filled into
   // |*http_status_code| to signify the type of redirect.
   //
   // The caller is responsible for following the redirect by setting up an
   // appropriate replacement Job. Note that the redirected location may be
   // invalid, the caller should be sure it can handle this.
@@ skipping 254 matching lines @@
   // The count of the number of packets, some of which may not have been timed.
   // We're ignoring overflow, as 1430 x 2^31 is a LOT of bytes.
   int observed_packet_count_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_JOB_H_