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The main objective is to remove all files reachable from chromevox/injected but not reachable from cvox2/. This resulted in a lot of files being pruned away including some old assets. There was some manual modifications like getting rid of ChromeVoxJSON, host/chrome/ files specific to content scripts, old keymaps, and more.

The testing/ files were also modified accordingly and chromevoxclassic was given its own testing/ fork.

Change-Id: I6f4130f901dcacb2601887d4bcd34d73ff732d56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880174
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709621}