Update TTS extension API docs to reflect latest changes. Note that this

chrome/renderer/resources/extension_process_bindings.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.
 
 // This script contains privileged chrome extension related javascript APIs.
 // It is loaded by pages whose URL has the chrome-extension protocol.
 
 var chrome = chrome || {};
 (function() {
   native function GetExtensionAPIDefinition();
@@ skipping 992 matching lines @@
         var parseResult = parseOmniboxDescription(
             userSuggestions[i].description);
         parseResult.content = userSuggestions[i].content;
         suggestions.push(parseResult);
       }
       return [requestId, suggestions];
     };
 
     apiFunctions["experimental.tts.speak"].handleRequest = function() {
       var args = arguments;
-      if (args.length > 1 && args[1] && args[1].onevent) {
+      if (args.length > 1 && args[1] && args[1].onEvent) {
         var id = GetNextTtsEventId();
         args[1].srcId = id;
-        chromeHidden.tts.handlers[id] = args[1].onevent;
+        chromeHidden.tts.handlers[id] = args[1].onEvent;
       }
       sendRequest(this.name, args, this.definition.parameters);
       return id;
     };
 
     if (chrome.test) {
       chrome.test.getApiDefinitions = GetExtensionAPIDefinition;
     }
 
     setupPageActionEvents(extensionId);
     setupToolstripEvents(GetRenderViewId());
     setupHiddenContextMenuEvent(extensionId);
     setupOmniboxEvents();
     setupTtsEvents();
   });
 
   if (!chrome.experimental)
     chrome.experimental = {};
 
   if (!chrome.experimental.accessibility)
     chrome.experimental.accessibility = {};
 
   if (!chrome.experimental.tts)
     chrome.experimental.tts = {};
 
   if (!chrome.experimental.ttsEngine)
     chrome.experimental.ttsEngine = {};
 })();