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

chrome/test/data/extensions/api_test/tts/optional_args/test.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // browser_tests.exe --gtest_filter="TtsApiTest.*"
 
 chrome.test.runTests([
   function testSpeakWithOptionalArgs() {
     // This will fail.
     try {
-      chrome.experimental.tts.speak();
+      chrome.tts.speak();
       chrome.test.fail();
     } catch (e) {
     }
 
     // This will succeed but nothing will be spoken.
-    chrome.experimental.tts.speak('');
+    chrome.tts.speak('');
 
     // This will succeed.
-    chrome.experimental.tts.speak('Alpha');
+    chrome.tts.speak('Alpha');
 
     // This will fail.
     try {
-      chrome.experimental.tts.speak(null);
+      chrome.tts.speak(null);
       chrome.test.fail();
     } catch (e) {
     }
 
     // This will succeed.
-    chrome.experimental.tts.speak('Bravo', {});
+    chrome.tts.speak('Bravo', {});
 
     // This will succeed.
-    chrome.experimental.tts.speak('Charlie', null);
+    chrome.tts.speak('Charlie', null);
 
     // This will fail.
     try {
-      chrome.experimental.tts.speak('Delta', 'foo');
+      chrome.tts.speak('Delta', 'foo');
       chrome.test.fail();
     } catch (e) {
     }
 
     // This will succeed.
-    chrome.experimental.tts.speak('Echo', {}, function() {});
+    chrome.tts.speak('Echo', {}, function() {});
 
     // This will fail.
     try {
-      chrome.experimental.tts.speak('Foxtrot', {}, 'foo');
+      chrome.tts.speak('Foxtrot', {}, 'foo');
       chrome.test.fail();
     } catch (e) {
     }
 
     chrome.test.succeed();
   }
 ]);