Make original_response_headers parameter of NetworkDelegate::OnHeadersReceived const

net/proxy/network_delegate_error_observer_unittest.cc

 // 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.
 
 #include "net/proxy/network_delegate_error_observer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop_proxy.h"
 #include "base/threading/thread.h"
@@ skipping 22 matching lines @@
   virtual int OnBeforeSendHeaders(URLRequest* request,
                                   const CompletionCallback& callback,
                                   HttpRequestHeaders* headers) OVERRIDE {
     return OK;
   }
   virtual void OnSendHeaders(URLRequest* request,
                              const HttpRequestHeaders& headers) OVERRIDE {}
   virtual int OnHeadersReceived(
       URLRequest* request,
       const CompletionCallback& callback,
-      HttpResponseHeaders* original_response_headers,
+      const HttpResponseHeaders* original_response_headers,
       scoped_refptr<HttpResponseHeaders>* override_response_headers) OVERRIDE {
     return net::OK;
   }
   virtual void OnBeforeRedirect(URLRequest* request,
                                 const GURL& new_location) OVERRIDE {}
   virtual void OnResponseStarted(URLRequest* request) OVERRIDE {}
   virtual void OnRawBytesRead(const URLRequest& request,
                               int bytes_read) OVERRIDE {}
   virtual void OnCompleted(URLRequest* request, bool started) OVERRIDE {}
   virtual void OnURLRequestDestroyed(URLRequest* request) OVERRIDE {}
@@ skipping 66 matching lines @@
   thread.message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&NetworkDelegateErrorObserver::OnPACScriptError,
                  base::Unretained(&observer), 42, string16()));
   thread.Stop();
   MessageLoop::current()->RunAllPending();
   // Shouldn't have crashed until here...
 }
 
 }  // namespace net