App Version (from "Chrome Settings > About Chrome"): 56 (beta)
Android version: 7.1
Device: Pixel C

Steps to reproduce: 
1. Go to http://browsingtest.appspot.com/autofill_smoke_test.html
2. fill the last form (name + password
3. Go back http://browsingtest.appspot.com/autofill_smoke_test.html
4. Start typing the name
5. Note that automplete is proposed

Observed behavior: 
6. You cannot select it with down key

Expected behavior: 
down key should select it.

Frequency: 
5/5

Additional comments: