Move ExtensionHostMsg_PostMessage IPC handling from

chrome/browser/renderer_host/chrome_extension_message_filter.h

Index: chrome/browser/renderer_host/chrome_extension_message_filter.h
diff --git a/chrome/browser/renderer_host/chrome_extension_message_filter.h b/chrome/browser/renderer_host/chrome_extension_message_filter.h
index 4a3f341bceda0210b5b83a1bc9f75b2041768282..781afea26aad9b5b54f7de45d47aa5b2dca4b9f5 100644
--- a/chrome/browser/renderer_host/chrome_extension_message_filter.h
+++ b/chrome/browser/renderer_host/chrome_extension_message_filter.h
@@ -24,6 +24,7 @@ class FilePath;
 
 namespace extensions {
 class InfoMap;
+struct Message;
 }
 
 // This class filters out incoming Chrome-specific IPC messages from the
@@ -80,6 +81,7 @@ class ChromeExtensionMessageFilter : public content::BrowserMessageFilter,
                                   int receiver_port_id,
                                   int tab_id, const std::string& extension_id,
                                   const std::string& channel_name);
+  void OnPostMessage(int port_id, const extensions::Message& message);
   void OnGetExtMessageBundle(const std::string& extension_id,
                              IPC::Message* reply_msg);
   void OnGetExtMessageBundleOnBlockingPool(