Revert "sec: deprecate some webPreference defaults to be secure-by-default (#14284)" (#14380)

This reverts commit 66d6ba8689.

lib/renderer/security-warnings.js

@@ -61,13 +61,6 @@ const getIsRemoteProtocol = function () {
  * @returns {boolean} Is a CSP with `unsafe-eval` set?
  */
 const isUnsafeEvalEnabled = function () {
-  // FIXME(MarshallOfSound): Although not exactly true, this warning is incorrect
-  // when contextIsolation is enabled
-  // FIXME(MarshallOfSound): Once remote issues have gone away we can remove
-  // the falsey check
-  const prefs = getWebPreferences()
-  if (prefs && prefs.contextIsolation) return false
-
   try {
     //eslint-disable-next-line
     new Function('');