Revert of PPAPI: Never re-enter JavaScript for PostMessage.

ppapi/proxy/dispatcher.h

Index: ppapi/proxy/dispatcher.h
diff --git a/ppapi/proxy/dispatcher.h b/ppapi/proxy/dispatcher.h
index f37308a871c73c9f115842cfe027a14bf468400c..68d67fe4d8b973eed9e5c75cf1c42b788ae70ea5 100644
--- a/ppapi/proxy/dispatcher.h
+++ b/ppapi/proxy/dispatcher.h
@@ -13,7 +13,6 @@
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/tracked_objects.h"
-#include "ipc/message_filter.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/ppp.h"
@@ -63,8 +62,8 @@
   // created so far.
   InterfaceProxy* GetInterfaceProxy(ApiID id);
 
-  // Adds the given filter to the IO thread.
-  void AddIOThreadMessageFilter(scoped_refptr<IPC::MessageFilter> filter);
+  // Adds the given filter to the IO thread. Takes ownership of the pointer.
+  void AddIOThreadMessageFilter(IPC::MessageFilter* filter);
 
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;