Remove IE support from Drupal.url.toAbsolute()

Problem/Motivation

Drupal.url.toAbsolute() in drupal.js contains old IE compatibility code:

    // Decode the URL first; this is required by IE <= 6. Decoding non-UTF-8
    // strings may throw an exception.
    try {
      url = decodeURIComponent(url);
    } catch (e) {
      // Empty.
    }

It is likely this can be removed.

Steps to reproduce

Proposed resolution

Remove the code.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet