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This reverts commit 6ceb3883.

Reason for revert: New tests have memory leaks.

https://ci.chromium.org/buildbot/chromium.memory/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/27171

Original change's description:
> Use user preferences for TTS speech rate, pitch and volume if not set.
> 
> Bug: 823359
> Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
> Change-Id: I772e1fa78e0f3f7ed3a6ab858f4855f65f18513f
> Reviewed-on: https://chromium-review.googlesource.com/1014491
> Commit-Queue: Katie Dektar <katie@chromium.org>
> Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: David Tseng <dtseng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#552826}

TBR=thakis@chromium.org,dtseng@chromium.org,jochen@chromium.org,katie@chromium.org

Change-Id: I8702500882bf4e8a499c7798306976bd18ad260b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 823359
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/1025290Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552929}