Remove with-styled-components Auto Prerendering warning (#7871)

examples/with-styled-components/pages/_app.js

@@ -9,16 +9,6 @@ const theme = {
 }
 
 export default class MyApp extends App {
-  static async getInitialProps ({ Component, ctx }) {
-    let pageProps = {}
-
-    if (Component.getInitialProps) {
-      pageProps = await Component.getInitialProps(ctx)
-    }
-
-    return { pageProps }
-  }
-
   render () {
     const { Component, pageProps } = this.props
     return (