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The previous implementation relied on autofill_agent finding forms, but
it is only interested in address and credit card forms. Instead, we call
the javascript function in CWVAutofillController to obtain all forms we
care about.

Also renamed delegate method from didFind to didScan since the former
implies that at least one was found but in many cases there are 0.

Bug: 905546
Change-Id: Ibb3144e767fe2257c20176d61315568cfde076cb
Reviewed-on: https://chromium-review.googlesource.com/c/1339322
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609048}