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This reverts changes:
4fe3a6a4 Ensure AccessibilityManager::ChromeVoxDeferredLoader's warmup utterance targets Googletts
8df286c2 Moves load progress tones from js to native

which were mainly workarounds for slow Google tts during the web assembly porteffort.

This revert removes now unnecessary complexity around ChromeVox's load path now that text to speech is native.

R=dmazzoni@chromium.org

TBR=dmazzoni@chromium.org

Change-Id: I8cdc9a946b1c112011aabfd3babd533aff03ed2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264193Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782002}