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The migration of the <certificate-manager> component itself has been
done in previous CLs. Here chrome://certificate-manager is simply
modified to display the Polymer 3 version of <certificate-manager>

Bug: 965770
Test: Navigate to chrome://certificate-manager. There should be no HTML Imports related warnings in DevTools.
Change-Id: I68f8aac10c9cf3aa94853670b0201beb87e4aebc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013860Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734696}