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

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
diff --git a/chrome/browser/renderer_host/render_view_host.cc b/chrome/browser/renderer_host/render_view_host.cc
index c788560ea3a3f63f9130347ce8375adf0a6aec7b..0f4df049b8e8027c77567c6a9543284affaa55bb 100644
--- a/chrome/browser/renderer_host/render_view_host.cc
+++ b/chrome/browser/renderer_host/render_view_host.cc
@@ -1555,9 +1555,10 @@ void RenderViewHost::SendExtensionResponse(int request_id, bool success,
 
 void RenderViewHost::OnExtensionPostMessage(
     int port_id, const std::string& message) {
-  URLRequestContext* context = process()->profile()->GetRequestContext();
-  ExtensionMessageService::GetInstance(context)->
-      PostMessageFromRenderer(port_id, message);
+  if (process()->profile()->GetExtensionMessageService()) {
+    process()->profile()->GetExtensionMessageService()->
+        PostMessageFromRenderer(port_id, message);
+  }
 }
 
 void RenderViewHost::OnAccessibilityFocusChange(int acc_obj_id) {