Move the tts and ttsEngine APIs out of experimental, and give

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 92687)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -3720,6 +3720,12 @@
       <message name="IDS_EXTENSION_PROMPT_WARNING_CLIPBOARD" desc="Permission string for access to clipboard.">
         Data you copy and paste
       </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_TTS" desc="Permission string for access to clipboard.">
+        Can allow any web page to speak

[Erik does not do reviews, 2011/07/15 23:04:04]

I don't think we need this one, but if we did, we'd need to change the wording
anyway, since the alert reads "This extension as access to...".  This also gives
you an indication that it probably isn't a security risk worth warning about.

[dmazzoni, 2011/07/20 05:58:04]

Sounds good, deleted.

+      </message>
+      <message name="IDS_EXTENSION_PROMPT_WARNING_TTS_ENGINE" desc="Permission string for access to clipboard.">
+        Any text spoken using synthesized speech
+      </message>
 
       <!-- Extension/App error messages -->
       <message name="IDS_EXTENSION_CANT_GET_ABSOLUTE_PATH" desc="Warning displayed in pack dialog when the absolute path to the extension directory can not be found.">