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

chrome/browser/extensions/extension_browser_event_router.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/extensions/extension_browser_event_router.h"
 
 #include "base/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/profile.h"
@@ skipping 67 matching lines @@
   return changed_properties;
 }
 
 ExtensionBrowserEventRouter* ExtensionBrowserEventRouter::GetInstance() {
   return Singleton<ExtensionBrowserEventRouter>::get();
 }
 
 static void DispatchEvent(Profile* profile,
                           const char* event_name,
                           const std::string json_args) {
-  ExtensionMessageService::GetInstance(profile->GetRequestContext())->
-      DispatchEventToRenderers(event_name, json_args);
+  if (profile->GetExtensionMessageService()) {
+    profile->GetExtensionMessageService()->
+        DispatchEventToRenderers(event_name, json_args);
+  }
 }
 
 static void DispatchSimpleBrowserEvent(Profile* profile,
                                        const int window_id,
                                        const char* event_name) {
   ListValue args;
   args.Append(Value::CreateIntegerValue(window_id));
 
   std::string json_args;
   JSONWriter::Write(&args, false, &json_args);
@@ skipping 243 matching lines @@
   object_args->Set(tab_keys::kDataKey, data);
 
   args.Append(object_args);
 
   std::string json_args;
   JSONWriter::Write(&args, false, &json_args);
 
   std::string event_name = extension_id + std::string("/") + page_action_id;
   DispatchEvent(profile, event_name.c_str(), json_args);
 }