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test_api.js depends on a bunch of JS libraries that appear in many lists.

This CL consolidates those dependencies to two places:
 - js2gtest.gni, and
 - A JsTestApiConfig class declared in chrome/test/base/js_test_api.h

Note not all lists captured the axs_testing.js dependency, but this change
uses the same dependency list in all locations for consistency.

TBR=aboxhall@chromium.org (mechanical change)

Bug: 1000989
Change-Id: If6e0716c03e42783a2d3529baa70475a9d305045
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900512
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714421}