Chrome Version:56.0.2912.0 (Official Build) 817f8b49ade74a199d0c83d11a7befb89e1a0ba5-refs/heads/master@{#430205}
OS: Windows (7,8,10), Linux

What steps will reproduce the problem?
1. Launch chrome and navigate to http://www.thewebjockeys.com/TheWebJockeys/Fillable_PDF_Sample_from_TheWebJockeys_vC5.pdf
2. Click on 'Your Last Name' text field and enter 'abcdefg'
3. Press 'Backspace' key from keyboard single time and observe the textfield.

Actual:Unnecessary two alphabet gets clear on single backspace key hit.
Expected: Only single alphabet should get clear after single backspace key hit.

This is regression issue, broken in 'M56' and will soon update the info:

Note: Issue is not seen on Mac OS.