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Settings: Simplify Polymer3 tests registration.

Given that JS Modules based tests no longer use |extraLibraries| to
pull in dependencies the definition of most tests classes looks
identical and can be automated with a for loop.

Tests that are still defined individually are either
 - enabled/disabled conditionally on some platforms
 - make use of |featureList|, runMochaSuite() or mocha.grep()

Bug: 1026426
Change-Id: Id13f2ba71487ca3031310db21a2b0f6bea9fb0aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116929
Commit-Queue: dpapad <dpapad@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753154}