Rename speech synthesis voice names.
This fixes an issue where built-in voices duplicate voice names for US English Female TTS (by Google), an engine available
from the webstore.
This change depends on a Chrome OS change to make the same voice renaming changes. When out of sync, it appears the voices don't work.
TEST=Manually verify every voice works (driven by ChromeVox).
BUG=none
Review URL: https://codereview.chromium.org/
398593002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285302 0039d316-1c4b-4281-b951-d872f2087c98