Changed the extension.connect() API not to broadcast to all tabs. Added a

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2006-2009 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include "build/build_config.h"
@@ skipping 945 matching lines @@
     }
     default: {
       NOTREACHED();
       break;
     }
   }
 }
 
 void BrowserRenderProcessHost::OnExtensionAddListener(
     const std::string& event_name) {
-  ExtensionMessageService::GetInstance(profile()->GetRequestContext())->
-      AddEventListener(event_name, pid());
+  if (profile()->GetExtensionMessageService()) {
+    profile()->GetExtensionMessageService()->AddEventListener(event_name,
+                                                              pid());
+  }
 }
 
 void BrowserRenderProcessHost::OnExtensionRemoveListener(
     const std::string& event_name) {
-  ExtensionMessageService::GetInstance(profile()->GetRequestContext())->
-      RemoveEventListener(event_name, pid());
+  if (profile()->GetExtensionMessageService()) {
+    profile()->GetExtensionMessageService()->RemoveEventListener(event_name,
+                                                                 pid());
+  }
 }
 
 void BrowserRenderProcessHost::OnExtensionCloseChannel(int port_id) {
-  ExtensionMessageService::GetInstance(profile()->GetRequestContext())->
-      CloseChannel(port_id);
+  if (profile()->GetExtensionMessageService()) {
+    profile()->GetExtensionMessageService()->CloseChannel(port_id);
+  }
 }