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Actually made it into a method instead since I felt asking a
CWVAutofillSuggestion for its property passwordSuggestion is kind of
confusing. As a method I think it's more clear.

Change-Id: I3eb32cfff01236f099dcda720a812bdaa0f78c20
Reviewed-on: https://chromium-review.googlesource.com/c/1347101
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610204}