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Use the HTMLImports polyfill in OOBE to remove the dependence
on HTML imports until everything can be fully migrated to JS
modules/Polymer3.

Bug: 1111387
Change-Id: I3c760bdc5d41f57e44927363d47a5a193edd7c34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522072
Commit-Queue: Renato Silva <rrsilva@google.com>
Auto-Submit: Renato Silva <rrsilva@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830571}