Certain permissions cannot be declared as optional (see usages of kFlagCannotBeOptional [1]).  While we don't let the extension request these permissions, it'd be better to throw a load error (or at least a warning) when loading the extension.

[1] https://chromium.googlesource.com/chromium/src/+/08d77f2bf2c8fcc644508037e7df7fb4619b1e1d/extensions/common/permissions/api_permission.h#369