Remove Pico-based speech synthesis service.

This capability is now being provided by a component extension.

BUG=chromium-os:36744
TEST=none
CQ-DEPEND=38858

Change-Id: I3e48f9542f97942a6b8b78e9c31ef28e59dddf52
Reviewed-on: https://gerrit.chromium.org/gerrit/38856
Commit-Ready: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Tested-by: Dominic Mazzoni <dmazzoni@chromium.org>
29 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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