Revert 203489 "Replace JSON (de)serialization of extension messa..."

trunk/src/chrome/browser/extensions/api/messaging/extension_message_port.h

Index: trunk/src/chrome/browser/extensions/api/messaging/extension_message_port.h
===================================================================
--- trunk/src/chrome/browser/extensions/api/messaging/extension_message_port.h	(revision 203729)
+++ trunk/src/chrome/browser/extensions/api/messaging/extension_message_port.h	(working copy)
@@ -9,10 +9,6 @@
 
 class GURL;
 
-namespace base {
-class ListValue;
-}
-
 namespace content {
 class RenderProcessHost;
 }  // namespace content
@@ -34,7 +30,7 @@
       const GURL& source_url) OVERRIDE;
   virtual void DispatchOnDisconnect(int source_port_id,
                                     const std::string& error_message) OVERRIDE;
-  virtual void DispatchOnMessage(scoped_ptr<base::ListValue> message,
+  virtual void DispatchOnMessage(const std::string& message,
                                  int target_port_id) OVERRIDE;
   virtual void IncrementLazyKeepaliveCount() OVERRIDE;
   virtual void DecrementLazyKeepaliveCount() OVERRIDE;