Chrome Version: 57.2987
OS: Windows 10

What steps will reproduce the problem?
(1) Visit http://webdbg.com/test/forms/creditcard.asp
(2) Start typing in credit card field
(3) Mouse hover the "Payment not secure" flyout item so it turns blue; observe that input focus is still visually in the Input field
(4) Hit Enter or Tab

What is the expected result? Next form field activates

What happens instead? Help topic launches

Keyboard activation is a part of the normal behavior for the autofill popup. But normally, when you hover over an autofill entry, doing so changes the input box's text
and hitting enter or tab  merely dismisses the autocomplete

e.g.
bool AutofillPopupControllerImpl::HandleKeyPressEvent(
 case ui::VKEY_RETURN:
     return AcceptSelectedLine();

Where
 // Returns the index of the selected line. A line is "selected" when it is
 // hovered or has keyboard focus.
 virtual int selected_line() const = 0;

In this case, it takes a very different action.

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.