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

chrome/browser/renderer_host/render_view_host_delegate.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_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "chrome/common/view_types.h"
 #include "net/base/load_states.h"
 #include "webkit/api/public/WebDragOperation.h"
 #include "webkit/glue/window_open_disposition.h"
 
 class AutofillForm;
 struct ContextMenuParams;
 class FilePath;
 class GURL;
+class Value;
 struct NativeWebKeyboardEvent;
 class NavigationEntry;
 class Profile;
 struct RendererPreferences;
 class RenderProcessHost;
 class RenderViewHost;
 class ResourceRequestDetails;
 class SkBitmap;
 class TabContents;
 struct ThumbnailScore;
@@ skipping 428 matching lines @@
                               WindowOpenDisposition disposition) {}
 
   // A DOM automation operation completed. The result of the operation is
   // expressed in a json string.
   virtual void DomOperationResponse(const std::string& json_string,
                                     int automation_id) {}
 
   // A message was sent from HTML-based UI.
   // By default we ignore such messages.
   virtual void ProcessDOMUIMessage(const std::string& message,
-                                   const std::string& content,
+                                   const Value* content,
                                    int request_id,
                                    bool has_callback) {}
 
   // A message for external host. By default we ignore such messages.
   // |receiver| can be a receiving script and |message| is any
   // arbitrary string that makes sense to the receiver.
   virtual void ProcessExternalHostMessage(const std::string& message,
                                           const std::string& origin,
                                           const std::string& target) {}
 
@@ skipping 69 matching lines @@
   virtual bool IsExternalTabContainer() const;
 
   // The RenderView has inserted one css file into page.
   virtual void DidInsertCSS() {}
 
   // A different node in the page got focused.
   virtual void FocusedNodeChanged() {}
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_H_