Add transaction detail params to requestAutocomplete().

Also, remove an unnecessary param from WebAutofillClient::didRequestAutocomplete
(the frame is easy to get from the WebFormElement)

BUG=354897

Review URL: https://codereview.chromium.org/214823008

git-svn-id: svn://svn.chromium.org/blink/trunk@171206 bbb929c8-8fbe-4397-9dbb-9b2b20218538