Modify extension request IPC messages to pass a ListValue instead of a string.

chrome/browser/extensions/extension_dom_ui.h

 // Copyright (c) 2009 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_EXTENSION_DOM_UI_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DOM_UI_H_
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/dom_ui/dom_ui.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
@@ skipping 11 matching lines @@
   explicit ExtensionDOMUI(TabContents* tab_contents);
 
   ExtensionFunctionDispatcher* extension_function_dispatcher() const {
     return extension_function_dispatcher_.get();
   }
 
   // DOMUI
   virtual void RenderViewCreated(RenderViewHost* render_view_host);
   virtual void RenderViewReused(RenderViewHost* render_view_host);
   virtual void ProcessDOMUIMessage(const std::string& message,
-                                   const std::string& content,
+                                   const Value* content,
                                    int request_id,
                                    bool has_callback);
 
   // ExtensionFunctionDispatcher::Delegate
   virtual Browser* GetBrowser();
 
   // BrowserURLHandler
   static bool HandleChromeURLOverride(GURL* url, Profile* profile);
 
   // Register and unregister a dictionary of one or more overrides.
@@ skipping 20 matching lines @@
 
   // When the RenderViewHost changes (RenderViewCreated and RenderViewReused),
   // we need to reset the ExtensionFunctionDispatcher so it's talking to the
   // right one, as well as being linked to the correct URL.
   void ResetExtensionFunctionDispatcher(RenderViewHost* render_view_host);
 
   scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DOM_UI_H_