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

trunk/src/chrome/browser/extensions/message_handler.h

Index: trunk/src/chrome/browser/extensions/message_handler.h
===================================================================
--- trunk/src/chrome/browser/extensions/message_handler.h	(revision 203729)
+++ trunk/src/chrome/browser/extensions/message_handler.h	(working copy)
@@ -9,10 +9,6 @@
 
 #include "content/public/browser/render_view_host_observer.h"
 
-namespace base {
-class ListValue;
-}
-
 namespace extensions {
 
 // Filters and dispatches extension-related IPC messages that arrive from
@@ -37,7 +33,7 @@
 
  private:
   // Message handlers.
-  void OnPostMessage(int port_id, const base::ListValue& message);
+  void OnPostMessage(int port_id, const std::string& message);
 
   DISALLOW_COPY_AND_ASSIGN(MessageHandler);
 };