Changed URLRequest::received_response_content_length() to be a const method.

net/url_request/url_request.h

 // Copyright (c) 2012 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_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 648 matching lines @@
 
   // NOTE(willchan): This is just temporary for debugging
   // http://crbug.com/90971.
   // Allows to setting debug info into the URLRequest.
   void set_stack_trace(const base::debug::StackTrace& stack_trace);
   const base::debug::StackTrace* stack_trace() const;
 
   void set_received_response_content_length(int64 received_content_length) {
     received_response_content_length_ = received_content_length;
   }
-  int64 received_response_content_length() {
+  int64 received_response_content_length() const {
     return received_response_content_length_;
   }
 
   // Available at NetworkDelegate::NotifyHeadersReceived() time, which is before
   // the more general response_info() is available, even though it is a subset.
   const HostPortPair& proxy_server() const {
     return proxy_server_;
   }
 
  protected:
@@ skipping 211 matching lines @@
 
   // The proxy server used for this request, if any.
   HostPortPair proxy_server_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_