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Before this patch, WebController could not find the form data if that
form data was in an iframe. The logic that cleaned up the selector of
the element that was clicked on to pass to GetElementFormAndFieldData
didn't trigger, as the frame index reported in FindElementResult was 0.

This patch takes another approach: it always only pass the last selector
to GetElementFormAndFieldData, which should make sense, since we're in
the same context as the element that was clicked on.

With this patch, Autofill works even when forms are in an iframe.

Bug: 806868
Change-Id: Ic7deaf863373659e9143c38cf01a6ca1406e6521
Reviewed-on: https://chromium-review.googlesource.com/c/1264600
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597164}