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This is the on-going process to finish up the fork of ChromeVox Classic.

Adding a build file will allow us to:
- compress the ChromeVox Classic source*
- remove deps.js which is a maintenance burden *
- share string resources *
- migrate all tests only for ChromeVox Classic to ui/accessibility/extensions
- delete all Classic only js, assets from mainline ChromeVox

* denotes things that happened in this change.

Change-Id: I317be0ff2107eeb1f688da8690c38d191a55310b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874256
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708822}