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Fix failing extensions browser tests for Polymer2.

Bug: 738611
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I00cb68204fa3206f29e50d7044e50f1e6b8cc753
Reviewed-on: https://chromium-review.googlesource.com/1109450
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569822}