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  * Change the TTS extension API to use the upstream TTS controller now
    that it's been moved out of chrome/ and into content/.
  * Requires downstream changes in internal/ to rework the platform,
    until those changes land, TTS will become a no-op.
  * Using upstream TtsController instead of our fork automagically
    makes it possible to enable and use the Speech Synthesis API

Bug: internal b/162974460
Merge-With: eureka-internal/434822
Test: manual, on device
Change-Id: I3acde313d177b74408394046a283b2da02dbff41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340703Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Randy Rossi <rmrossi@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796433}