Update TTS extension.

BUG=chromium:801334
TEST=Used Chrome TTS Demo and Chrome TTS debug extension. Assorted
select-to-speak and chromevox use cases. Tested on Chrome OS emulated on
linux and Snappy chromebook.
CQ-DEPEND=CL:871134
Change-Id: I8d6ff0df0317ae6428ac44e4affcad673dc7a57f
Reviewed-on: https://chromium-review.googlesource.com/871136
Commit-Ready: Katie Dektar <katie@chromium.org>
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Commit-Ready: Dominic Mazzoni <dmazzoni@chromium.org>
Tested-by: Katie Dektar <katie@chromium.org>
Tested-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
35 files changed