Add support for response header manipulation in Declarative WebRequest API

chrome/browser/extensions/api/web_request/web_request_api.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_WEB_REQUEST_WEB_REQUEST_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_H_
 #pragma once
 
 #include <list>
 #include <map>
@@ skipping 312 matching lines @@
   // Processes the generated deltas from blocked_requests_ on the specified
   // request. If |call_back| is true, the callback registered in
   // |blocked_requests_| is called.
   // The function returns the error code for the network request. This is
   // mostly relevant in case the caller passes |call_callback| = false
   // and wants to return the correct network error code himself.
   int ExecuteDeltas(void* profile, uint64 request_id, bool call_callback);
 
   // Evaluates the rules of the declarative webrequest API and stores
   // modifications to the request that result from WebRequestActions as
-  // deltas in |blocked_requests_|. Returns whether any deltas were
-  // generated.
-  bool ProcessDeclarativeRules(net::URLRequest* request,
-                               extensions::RequestStages request_stage);
+  // deltas in |blocked_requests_|. |original_response_headers| should only be
+  // set for the OnHeadersReceived stage and NULL otherwise. Returns whether any
+  // deltas were generated.
+  bool ProcessDeclarativeRules(
+      net::URLRequest* request,
+      extensions::RequestStages request_stage,
+      net::HttpResponseHeaders* original_response_headers);
 
   // Sets the flag that |event_type| has been signaled for |request_id|.
   // Returns the value of the flag before setting it.
   bool GetAndSetSignaled(uint64 request_id, EventTypes event_type);
 
   // Clears the flag that |event_type| has been signaled for |request_id|.
   void ClearSignaled(uint64 request_id, EventTypes event_type);
 
   // Returns whether |request| represents a top level window navigation.
   bool IsPageLoad(net::URLRequest* request) const;
@@ skipping 65 matching lines @@
   virtual void OnQuotaExceeded() OVERRIDE;
   virtual bool RunImpl() OVERRIDE;
 };
 
 // Send updates to |host| with information about what webRequest-related
 // extensions are installed.
 // TODO(mpcomplete): remove. http://crbug.com/100411
 void SendExtensionWebRequestStatusToHost(content::RenderProcessHost* host);
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_H_