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Google Assistant is usually configured during OOBE. When the
user skips voice match during OOBE, an in-session UI is used
to train the system to recognize the user's voice.

Migrate Google Assistant in-session UI off HTML imports by
using the HTML Imports polyfill. This polyfill is currently
also being used for the whole OOBE.

Tested on a Pixelbook.

Bug: 1111849
Change-Id: I237fbb2bec88bf265610edbc6b0ed13b9bc54be9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632683Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Renato Silva <rrsilva@google.com>
Cr-Commit-Position: refs/heads/master@{#844736}