Chrome: Unbale to get 'keydown' event

[Irina]

Steps to reproduce:

1. open any sample in Chrome, clear it's content
2. Run following in the console:

CKEDITOR.instances.[EDITOR_INSTANCE_ID].document.on('keydown', function(event) {

console.log('KEYDOWN EVENT');

});

3. Type few letters, e.g. abc

Result: console will print that keydown event occurred 3 times, e.g. (3)KEYDOWN EVENT

4. Press enter key

Result: key down event not detected and this is expected behaviour for this key

5. press Backspace key

Actual result: key down event not detected

Expected result: console will print that keydown event occurred 4 times, e.g. (4)KEYDOWN EVENT