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Add missing imports of assert.html for elements that are using assert
but not importing it currently. Also add to deps for closure compiler
for settings_idle_load. This is in preparation for autogenerating
Polymer 3 versions of these files.

Bug: 1026426
Change-Id: I22eacc796d159ff24813c1cccd5c5c9e386e7cfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028658
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Auto-Submit: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736580}