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During Autofill captured sites tests, when there is a new popup,
it appears the RenderFrameHost is not always owned by the current WebContents.
This may be a further issue with the way current_main_rfh_ but this change
just ensures that the pointer exists before attempting to retrieve
it's autofill_manager instance.

This fixes 2 existing Autofill captured sites tests.

Bug: 988532
Change-Id: I0b60679843900c8313fc18f71e00cd64faf78528
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724494
Commit-Queue: Ian Struiksma <ianstruiksma@google.com>
Reviewed-by: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683283}