Move the Extension Port implementation out of messaging.js into its own file port.js.

extensions/renderer/dispatcher.cc

 // 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.
 
 #include "extensions/renderer/dispatcher.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 492 matching lines @@
                                      IDR_GUEST_VIEW_CONTAINER_JS));
   resources.push_back(std::make_pair("guestViewDeny", IDR_GUEST_VIEW_DENY_JS));
   resources.push_back(std::make_pair("guestViewEvents",
                                      IDR_GUEST_VIEW_EVENTS_JS));
   resources.push_back(std::make_pair("imageUtil", IDR_IMAGE_UTIL_JS));
   resources.push_back(std::make_pair("json_schema", IDR_JSON_SCHEMA_JS));
   resources.push_back(std::make_pair("lastError", IDR_LAST_ERROR_JS));
   resources.push_back(std::make_pair("messaging", IDR_MESSAGING_JS));
   resources.push_back(std::make_pair("messaging_utils",
                                      IDR_MESSAGING_UTILS_JS));
+  resources.push_back(std::make_pair("port", IDR_PORT_JS));
   resources.push_back(std::make_pair(kSchemaUtils, IDR_SCHEMA_UTILS_JS));
   resources.push_back(std::make_pair("sendRequest", IDR_SEND_REQUEST_JS));
   resources.push_back(std::make_pair("setIcon", IDR_SET_ICON_JS));
   resources.push_back(std::make_pair("surfaceWorker", IDR_SURFACE_VIEW_JS));
   resources.push_back(std::make_pair("test", IDR_TEST_CUSTOM_BINDINGS_JS));
   resources.push_back(
       std::make_pair("test_environment_specific_bindings",
                      IDR_BROWSER_TEST_ENVIRONMENT_SPECIFIC_BINDINGS_JS));
   resources.push_back(std::make_pair("uncaught_exception_handler",
                                      IDR_UNCAUGHT_EXCEPTION_HANDLER_JS));
@@ skipping 919 matching lines @@
   // The "guestViewDeny" module must always be loaded last. It registers
   // error-providing custom elements for the GuestView types that are not
   // available, and thus all of those types must have been checked and loaded
   // (or not loaded) beforehand.
   if (context_type == Feature::BLESSED_EXTENSION_CONTEXT) {
     module_system->Require("guestViewDeny");
   }
 }
 
 }  // namespace extensions