[chromecast] Remove unused TTS engine JS bindings.

Bug: none
Test: manual on device
Change-Id: I93f2ce564ac1c519c0769432822f64ee858f03db
Reviewed-on: https://chromium-review.googlesource.com/1104313Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568083}

chromecast/renderer/resources/extensions/tts_engine_custom_bindings.js

-// Copyright (c) 2012 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.
-
-// Custom binding for the ttsEngine API.
-
-var binding = apiBridge || require('binding').Binding.create('ttsEngine');
-var registerArgumentMassager = bindingUtil ?
-    $Function.bind(bindingUtil.registerEventArgumentMassager, bindingUtil) :
-    require('event_bindings').registerArgumentMassager;
-
-registerArgumentMassager('ttsEngine.onSpeak', function(args, dispatch) {
-  var text = args[0];
-  var options = args[1];
-  var requestId = args[2];
-  var sendTtsEvent = function(event) {
-    chrome.ttsEngine.sendTtsEvent(requestId, event);
-  };
-  dispatch([text, options, sendTtsEvent]);
-});
-
-if (!apiBridge)
-  exports.$set('binding', binding.generate());

chromecast/renderer/resources/extensions_renderer_resources.grd

@@ -14,7 +14,6 @@
       <include name="IDR_AUTOMATION_NODE_JS" file="extensions\automation\automation_node.js" type="BINDATA" />
       <include name="IDR_TABS_CUSTOM_BINDINGS_JS" file="extensions\tabs_custom_bindings.js" type="BINDATA" />
       <include name="IDR_TTS_CUSTOM_BINDINGS_JS" file="extensions\tts_custom_bindings.js" type="BINDATA" />
-      <include name="IDR_TTS_ENGINE_CUSTOM_BINDINGS_JS" file="extensions\tts_engine_custom_bindings.js" type="BINDATA" />
     </includes>
   </release>
 </grit>