Steps to reproduce the problem:
1. Enter a real search query, and add some giberish to the end. Example: "austin weatherweathe" (keyboard lag).
2. Repeat the search, if necessary, so that the bad query becomes the autocomplete suggestion.
3. Type "austin weather", and hit backspace to clear highlighted portion of suggestion "austin weatherweathe" (delete "weathe").
4. Wait several seconds (to ensure nothing changes an instant before submitting).
5. Press enter/search to submit "austin weather"
6. Watch as "weathe" is re-appended.

What is the expected behavior?
Search query should not differ from what was visible in the omnibar on submit.

What went wrong?
Extra text is consistently re-appended immediately after submitting.

Did this work before? N/A 

Chrome version: 64.0.3282.137  Channel: stable
OS Version: 6.0.1
Flash Version: