Change record status: 
Project: 
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Description: 

file_progress_implementation() is deprecated and replaced with extension_loaded('uploadprogress').

As we only currently support the 'uploadprogress' extension, just checking extension_loaded('uploadprogress') simplifies this.

Before:

$implementation = file_progress_implementation()
if ($implementation === 'uploadprogress') {
  // do something
}

After:

if (extension_loaded('uploadprogress')) {
  // do something
}
Impacts: 
Module developers