Returns a method that will act like `ipc.send` depending on the parameter
passed to it, so you don't have to check for `webContents`.

@param  {BrowserWindow|WebView} windowOrWebView    The renderer to send to.

@return {Function}                                 A function that behaves like
`ipc.send`.

@private
function getSendMethod(windowOrWebView) {
  if (!windowOrWebView) return (...a) => ipc.send(...a);

  if ('webContents' in windowOrWebView) {
    return (...a) => {
      d(`webContents send: ${JSON.stringify(a)}`);
      if (!windowOrWebView.webContents.isDestroyed()) {
        windowOrWebView.webContents.send(...a);
      } else {
        throw new Error(`WebContents has been destroyed`);
      }
    };
  } else {
    return (...a) => {
      d(`webView send: ${JSON.stringify(a)}`);
      windowOrWebView.send(...a);
    };
  }
}