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SettingsAccessibilityTest is now only used by the OS settings a11y
tests, because browser settings a11y tests have been migrated to use
SettingsAccessibilityV3Test. Rename the class and folder to reflect
this, change the browsePreload to chrome://os-settings, and remove
extraLibraries and setup logic that were only used by browser settings.
This allows several OS settings a11y subclasses to inherit from the
new OSSettingsAccessibilityTest, and avoid needing to override
browsePreload. Include the file in the build only on Chrome OS, and
remove the line disabling kSettingsPolymer3 as this is no longer
respected.

Bug: 1069258
Change-Id: I38a719d6156c6e4505f7c63cd9c6a9060b4c1adc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2150295
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759505}