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Since /deep/ is deprecated in shadow DOM v1, track highlights and
search bubbles as they are added to avoid searching recursively to
remove them later.

Bug: 852098
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Iac61a1f340ae4029589556c3ad09e567126a1639
Reviewed-on: https://chromium-review.googlesource.com/1100102
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568108}