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This reverts commit 8965b37f.

Reason for revert: TrayAccessibilityTestInstance tests failing on bots

https://uberchromegw.corp.google.com/i/chromium.chromiumos/builders/linux-chromeos-dbg

https://uberchromegw.corp.google.com/i/chromium.chromiumos/builders/linux-chromeos-dbg/builds/4171

Original change's description:
> Add Select-to-Speak to accessibility menu in status tray.
> 
> Includes new icon for Select-to-Speak.
> Having STS in the status tray was approved by UX over email, so this is
> not behind any flags.
> 
> Bug: 804506
> Change-Id: Icdeda04e2c10db7ba891cfed585db0027dcb97b5
> Reviewed-on: https://chromium-review.googlesource.com/904968
> Commit-Queue: Katie Dektar <katie@chromium.org>
> Reviewed-by: James Cook <jamescook@chromium.org>
> Reviewed-by: Ilya Sherman <isherman@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#535813}

TBR=jamescook@chromium.org,tbarzic@chromium.org,dmazzoni@chromium.org,isherman@chromium.org,katie@chromium.org

Change-Id: Iba6c1fb5b36483bfd75adcde1e67e8036ad0d5a4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 804506
Reviewed-on: https://chromium-review.googlesource.com/911884Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Commit-Queue: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535904}