Remove port lifetime management from renderer

extensions/renderer/messaging_bindings.h

 // Copyright 2014 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 EXTENSIONS_RENDERER_MESSAGING_BINDINGS_H_
 #define EXTENSIONS_RENDERER_MESSAGING_BINDINGS_H_
 
 #include <string>
 
 #include "extensions/renderer/script_context_set.h"
 
 struct ExtensionMsg_ExternalConnectionInfo;
 struct ExtensionMsg_TabConnectionInfo;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace content {
 class RenderFrame;
 }
 
 namespace v8 {
 class Extension;
 }
 
 namespace extensions {
-class Dispatcher;
 struct Message;
 class ObjectBackedNativeHandler;
 class ScriptContextSet;
 
 // Manually implements JavaScript bindings for extension messaging.
 //
 // TODO(aa): This should all get re-implemented using SchemaGeneratedBindings.
 // If anything needs to be manual for some reason, it should be implemented in
 // its own class.
 class MessagingBindings {
  public:
   // Creates an instance of the extension.
-  static ObjectBackedNativeHandler* Get(Dispatcher* dispatcher,
-                                        ScriptContext* context);
+  static ObjectBackedNativeHandler* Get(ScriptContext* context);
+
+  // Checks whether the port exists in the given frame. If it does not, a reply
+  // is sent back to the browser.
+  static void ValidateMessagePort(const ScriptContextSet& context_set,
+                                  int port_id,
+                                  content::RenderFrame* render_frame);
 
   // Dispatches the onConnect content script messaging event to some contexts
   // in |context_set|. If |restrict_to_render_frame| is specified, only contexts
   // in that render frame will receive the message.
   static void DispatchOnConnect(const ScriptContextSet& context_set,
                                 int target_port_id,
                                 const std::string& channel_name,
                                 const ExtensionMsg_TabConnectionInfo& source,
                                 const ExtensionMsg_ExternalConnectionInfo& info,
                                 const std::string& tls_channel_id,
@@ skipping 11 matching lines @@
   static void DispatchOnDisconnect(
       const ScriptContextSet& context_set,
       int port_id,
       const std::string& error_message,
       content::RenderFrame* restrict_to_render_frame);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_MESSAGING_BINDINGS_H_