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

chrome/browser/extensions/extension_browser_event_router.cc

Index: chrome/browser/extensions/extension_browser_event_router.cc
diff --git a/chrome/browser/extensions/extension_browser_event_router.cc b/chrome/browser/extensions/extension_browser_event_router.cc
index a689d323aff102d1df3abf11c915b44fab81e66d..1fcb3e70701491c919b37c1ca91ff614220f9f4e 100644
--- a/chrome/browser/extensions/extension_browser_event_router.cc
+++ b/chrome/browser/extensions/extension_browser_event_router.cc
@@ -85,8 +85,10 @@ ExtensionBrowserEventRouter* ExtensionBrowserEventRouter::GetInstance() {
 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,