Make original_response_headers parameter of NetworkDelegate::OnHeadersReceived const

chrome/browser/extensions/api/declarative_webrequest/webrequest_rule.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 CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULE_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 32 matching lines @@
   typedef std::string ExtensionId;
   typedef std::string RuleId;
   typedef std::pair<ExtensionId, RuleId> GlobalRuleId;
   typedef int Priority;
 
   struct RequestData {
     RequestData(net::URLRequest* request, RequestStage stage)
         : request(request), stage(stage),
           original_response_headers(NULL) {}
     RequestData(net::URLRequest* request, RequestStage stage,
-                net::HttpResponseHeaders* original_response_headers)
+                const net::HttpResponseHeaders* original_response_headers)
         : request(request), stage(stage),
           original_response_headers(original_response_headers) {}
     net::URLRequest* request;
     RequestStage stage;
     // Additional information about requests that is not
     // available in all request stages.
-    net::HttpResponseHeaders* original_response_headers;
+    const net::HttpResponseHeaders* original_response_headers;
   };
 
   WebRequestRule(const GlobalRuleId& id,
                  base::Time extension_installation_time,
                  scoped_ptr<WebRequestConditionSet> conditions,
                  scoped_ptr<WebRequestActionSet> actions,
                  Priority priority);
   virtual ~WebRequestRule();
 
   // If |error| is empty, the translation was successful and the returned
@@ skipping 42 matching lines @@
   scoped_ptr<WebRequestConditionSet> conditions_;
   scoped_ptr<WebRequestActionSet> actions_;
   Priority priority_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRequestRule);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_RULE_H_