BUG ID: 4532113 REGRESSION (NativeTextField): Crash occurs after modifying field then reloading page -[FormDelegate frameLayoutHasChanged:]

STEPS TO TEST:

1. enable Safari's auto fill
2. type something in the input field, and press enter to register it with autofill
3. clear the field and type part of the same string you did previously
4. without ever removing focus from the input field, select the suggestion autofill suggests
5. refresh the page or go to a bookmark (don't remove focus from the input field)

TEST PASS: no crash.

TEST FAIL: Crash in -[FormDelegate frameLayoutHasChanged:]