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Previously, the frame's RenderFrameHost (RFH) was selected
based on its name / url. This only works if the site actively
sets the name attribute on the iframe it uses, which was not
done everywhere. Resolving with id seems more stable.
Fallback to name / url is kept in place for the time being.

This fixes the resolution (and thus the autofill) for both local
iframes and OOPIF.

Note: This is a copy of crrev/c/1893876
Refer to that for discussions. The original change could not be
submitted because an unintended somehow irreversible checkin blocked
the submit.

Bug: b/143318024
Change-Id: I6fc3ea0d210b500e06769c5129e00766d933eb65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899775Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#712588}