Fix broken manifest (broken by change 18)
Fix broken manifest (broken by change 18)

luojunqiang/google-tasks-chrome-extension,xingh/google-tasks-chrome-extension,gibfahn/google-tasks-chrome-extension,bf4648/google-tasks-chrome-extension,bf4648/google-tasks-chrome-extension,tiagowap/google-tasks-chrome-extension,gibfahn/google-tasks-chrome-extension,xingh/google-tasks-chrome-extension,tiagowap/google-tasks-chrome-extension,luojunqiang/google-tasks-chrome-extension