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This was making refactoring for https://crbug.com/879958 difficult.

Closure-compile existing unit_tests for the image_loader extension, and
delete the handcrafted unittest.html files.

Bug: 860355
Change-Id: I0d99d0383eb8fe48813d9142a14ce9af28da2dc5
Reviewed-on: https://chromium-review.googlesource.com/1207784Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589377}