Steps to reproduce the issue

The JBrowser::hasFeature() has been removed from Joomla CMS 3.x. However, this removed function is used in the very JBrowser source code. Specifically, hasFeature() is called at /libraries/joomla/environment/browser.php line 607 (inside function isViewable).

I think that hasFeature() should be removed from JBrowser source code and an alternative algorithm should be used at that point.

To reproduce this error, I wrote this code:

$browser = JBrowser::getInstance(null, "");
$browser->isViewable('foo/nothing');

Expected result

True or False

Actual result

Fatal error: Call to undefined method JBrowser::hasFeature() in /libraries/joomla/environment/browser.php on line 607

System information (as much as possible)

Joomla CMS 3.3 (staging)

Additional comments

If JBrowser::hasFeature is directly call, you get a " Fatal error: Call to undefined method JBrowser::hasFeature()...", such as running:

$browser = JBrowser::getInstance();
$browser->hasFeature('image');