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This not only results to smaller file size, but also makes the code more
portable, since it is less dependent on chrome:// URLs, and can eventually
lead to running those elements and tests outside the context of a browser_tests
and without js2gtest.

Bug: 866236
Change-Id: I26b4a22f61b10cbbd1a19c5e055bb5c0f2aaf471
Reviewed-on: https://chromium-review.googlesource.com/1150931Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578913}